If you hereby this thread at night take a popcorn  but  if its morning there a coffee will be suitable.
I am not going to argue Bitcoin will never become mainstream etc.
Bitcoin would reach to 10 trillion usd market cap like gold did.
Thats highly possible..
That means 500.000 usd = 1 Bitcoin

Bitcoin as a money is something I wouldn't want to see and I have my reasons as opinion. Bitcoin will is a speculation assets and such assets doesn't qualify as a currency but as a value just like gold, this is why some economist says Bitcoin is not here to compete with dollar but it's here to compete with Gold and the rest because Gold is not deflationary in supply while Bitcoin is, just 21 million maximum supply to ever exist so it can create scarcity, tbe Gold market can be diluted without much notice, you can't do such with Bitcoin.

Let's government allow everyone buys and hold Bitcoin, if it's tax there is not problem but they should be considerate just like they treat stock investment with tax, this will make it fair for everyone to buy Bitcoin and even makes everyone knows what Bitcoin is about. Imagine Bitcoin been discussed on national television about the risk and how it operate, people will trade carefully and invest in their on ways.

Ah, the "big block is gud" myth again. Monero, Bitcoin SV and other coins with theoretically unlimited block size would have also problems to handle a Visa-level transaction throughput -- with one exception: those that embrace centralization.

Now imagine a coin, for example Monero after years of blockchain growth via its adaptive mechanism, with 1 GB of block size, where only 20 nodes worldwide would have the capacity to operate a full node, and all others need some sort of SPV connection. Wouldn't that be a bit scary for a privacy coin?

See also this: https://www.reddit.com/r/Monero/comments/hyo31f/monero_theoretical_maximum_transactions_per_second/ - even in the absolute best case scenario described there, it would not be able to scale like a centralized system like Visa.

I've already mentioned the solution several times: second layers. And yes, these are crucial to "go mainstream" "as money". There are however also other problems currently, mainly volatility, which is again fueled by the speculative usage of most investors, but is not related to the protocol.

You have actually not brought up any reason why you don't want to see Bitcoin as money.

Bitcoin as money is actually the only model where its technology really makes sense. It doesn't have to be used to buy coffee or for other small amounts. But its censorship resistance and decentralization actually only makes sense if it's considered a kind of value you might transfer eventually, for example to save it for some time but then use it to buy a car or a house. Certainly censorship resistance isn't crucial for an asset a central bank wants to hold in a Fort Knox-style bunker (with one catch: if the state holding it is a sanctioned pariah then it makes sense, but do we really want this for Bitcoin, to be used by DPRK, Iran and friends?).