I don't think it's going to happen but the government has some control over it and they could just regulate new ones with the rules set or stricter about crypto custody but for those who have assets on centralized exchanges whereas if we store in non-custodial wallets then it's possible the government will have a hard time taking those bitcoins so it's not advisable to store them on an exchange in fact it will be a problem later on.

But I don't think this will happen in some countries, because a country that is strict they will definitely impose this kind of regulation but for small countries it won't happen because my assumption is that countries are at peace with bitcoin then it will be fine not to emphasize bitcoin users.

My country has stipulated this where every crypto transaction on a centralized exchange will be taxed and this has been going on for some time, but they are still happy with the regulations where crypto users are now required to pay taxes.
Of course this is still relevant and does not contradict anymore.

This is not possible because you're not using a centralized exchange wallet, if you're using a centralized exchange wallet then you have this risk on loosing your asset because it does not belong to you yet as long as you're not having the keys in your hands, we cannot compare using a decentralized asset from a centralized exchange because the difference is clear, bitcoin is a decentralized digital currency unlike gold or other physical asset.

Do they really need to find a way to pass any bills that will allow them to take over private property? 
The government is already in one way or another in control of our lives, properties, and belongings; there's just a little something holding them down, and that something isn't the law because they are the law themselves. 
All they need is a reason to do something, and they will just do it. 

We are never free from government attack and suppression, which is why the only way out is a decentralized system where you are the only one with rights over your properties (funds). This is another reason why they are against the crypto community: they are depriving them of a lot of things and taking things out of their control. 

The US government was able to seize all the gold own by it's citizens back then in 1900s simply because gold is physical, can be touch and feel unlike Bitcoin that is digital, decentralized and can't be traced with the help of "mixers", because what O.P fails to reason is that what if unfortunately, such happens to take place, how will the government know how many citizens who own BTC and how many BTC do they own? Because with the help of cold wallets, it's likely impossible for any government to know how much funds people own in crypto, of which its best option will be to tax exchanges who does business with it's citizens.

People who keep their crypto in exchange and online wallets will lose their assets and the government can control their accounts or can seize them if they want. So that is why you don't store your crypto currency and bitcoin in an online wallet or exchange.

The beauty of bitcoin is that you, only you can control them if you store them on a hard wallet or non-custodial wallet. So keep your assets where you can control them.

I don't think they can do that at all because one of the motives behind the creation of Bitcoin was to gain one's economic freedom. Because the matter is online and it is difficult to trace the owner of the wallet by tracking the transaction only through the wallet address. And if it can do that, people's trust will go away from Bitcoin. If the government closes the centralize exchanges, then if people build a peer to peer community among themselves, then the work will continue even after the ban or seize. However, developed countries like the USA can use their technology to stop the use of bitcoins even if they cannot seize their owners.

If the centralized exchanger is in that country or can be controlled by the regulator of that country, then the user's funds will be seized.

If this happens is really going to happened ever then non-custodial online wallet will be the option for holding bitcoins because if you use hardware wallet for holding on that time then at first you have to buy hardware and where from you buy that product there can be a option of tracking to you and at the end you will be seize

This must be on the mind of most people. That's why a lot of people are encouraging people to withdraw their Bitcoins from the exchanges and store them in their personal wallets where they are the only ones who can control them. As what famous quote says: "Not your keys, not your coins".

That wouldn't be possible. I keep my Bitcoin in OWNR wallet, how could you take it away from me? I can just delete my app and keep my seed phrase somewhere safe, and no one would be able to prove that I even had any crypto. But that would be harder if you keep your crypto on an exchange or in the wallet if you did proceed with the KYC.

That's difficult. I mean, how will they do it? It is not the same with gold in that they can see it physically, and they only got the gold that was known to be huge that they'd found. In crypto, for sure, it would be difficult because they couldn't just go to your house and get your crypto; they didn't have the key to access it. So it is impossible to do it.