Sure we could very well see BTC being a reserve currency in 10 years or something but do you expect those entire 10 years to be just up without crashes and bear markets?

Exaxctly. I've agreed all of them. I believe same things. Besides I believe BTC will be used to supply high tech alt coins for low cost and instant transaction times for micro payments. This is simular with that goverments reserved gold to supply their own money to market. Same thing will be happen in crypto world. Companies will keep BTC to create their coins.

Bitcoin will never be zero in value, because the number of uses, and bitcoin is very good for fund or reserve money because it has value and prices are always increasing.

I can not say anything to the USD, but oil and gold will lose their value over time.

If we talk about oil, the current technology is in development and people are starting to use alternative energy. Even cars now work with electricity.

Gold is so expensive that it is limited in the world and it is just a type of metal. I mean, there's a lot of metal that can take it place.

The trend of Bitcoin will not continue lifelong, generally Bitcoin doesn't worth a billion dollars, but it is the present-day trend, and it is not worthy of the current price.

Currency not only has the value of a currency attribute, and due to excessive imitation of gold natural attribute, not only the amount limit, and even the output of every 10 minutes to be qualified, its production is not gradually increase, but less and less.

With the development of society, the function of saving will be brought into play.

Bitcoin accelerates as a world reserve currency
Recently, the People's Bank of China has helped boost Bitcoin's reputation by meeting with executives of the largest Bitcoin trading platforms in China.
In fact, officials from the People's Bank of China met the BTCC on January 6, 2017.
The purpose of the meeting was to "call for a fair investment in Bitcoin," Reuters reported.
However, most importantly, the meeting proved that the authorities at the People's Bank of China are trying to consider the appropriate Bitcoin business.
Commenting on the meeting between the People's Bank of China - BTCC, a Reddit user, vapor114 wrote: "China only adds benefits to the MOF by recognizing that the exchange of Bitcoin between businesses is French. "
Moreover, this is not the first time that BTCC met with the bank. A statement from the BTCC: "The BTCC regularly meets with the People's Bank of China and we work closely with them to ensure that we are operating in accordance with the laws and regulations of China."

bitcoin devs have given up fixing bitcoin issues and pretty much unanimously declared bitcoins blockchain as broke(unscalable)
and so they are now declaring bitcoin as not peer to peer cash. but as a reserve whereby the blockchain becomes a locked fortknox vault for LN and people end up moving value via unconfirmed unaudied receipts of value on the LN network

only issue is LN is not a unique network just for bitcoin value. but will be open to all other values too. so eventually people wont want to settle back to bitcoins but to other chains that are cheaper fee and faster confirms.. and if they want to settle back to bitcoin there is no actual 100% guarantee they will be able to for full value without delay/restrictions/agreement by counterparty/punishment

yep bitcoin can actually scale. but devs want people to lock value into managed accounts. and charge fee's and penalties for the honour of co-managing the account(channel).
much like what happened to gold when bankers came along with paper money.

if people cannot see the issues with this. then they only care about a fiat exit price and not a bitcoin viable currency without middlemen.
remember even when bank notes said it would give a holder X amount of gold.. they were not actually holding gold. same will be said in a few years when people are trading LN payments

seems no one has learned the lessons of 100 years ago.

THe important word here is countries. Since they are ruled by governments and those governments are in debt, unable to function without printing more and more fiat money, they will never be able to or even willing to switch to a decentralized cryptocurrency or even a currency backed by gold or anything else. What Maduro is trying to dois his swan song. People may embrace it but governments won't. Even if 60% of people in a country wanted Bitcoin to become their national currency, the government wouldn't agree because it would mean paying debts that can't be paid, getting real money out of nothing.

In my opinion, when the bitcoin becomes the reserve currency, it is not yet certain, because there is still a new currency or another backup, and can also still not acceptable bitcoin in all countries