By 2025 Bitcoin will probably be used as backup for main currencies and it would be much easier and faster to trade with Bitcoin than it is with gold.
People need to realize that nobody can stop them if they want to separate money from state and use Bitcoin for that.
Actually, the government can stop their respective citizens from using Bitcoin for anything in their respective countries. With growing demand, many countries are planning their centralized crypto. Hence, Bitcoin to be used as backup currency is tough enough to happen. Also, another reason is the price fluctuation which will stop many to use Bitcoin as a currency.
But obviously, it will be traded to earn profits rather than using to transact or use it on daily basis on every purchase. I just hope no country puts a ban on any cryptos.