Have you ever been concerned about Bitcoin's longevity in the mainstream world as a decentralized cryptocurrency? While BTC has been going strong since 2009, there exist the possibility that it could vanish from existence sometime in the future. After all, we know that nothing lasts forever.
My guess is that once governments start circulating their own digital currencies, they will try to crackdown on Bitcoin and other cryptocurrencies as we know them. It's no secret that the entire crypto space is largely dependent on centralized infrastructure (centralized exchanges, centralized wallet services, etc). People will not want to use something that's considered "illegal" by worldwide governments. While it'll still be possible to continue using Bitcoin regardless of government bans, regulations, etc, not many people will support it (only libertarians, geeks, anarchists, etc.). By that time, it'll be nearly impossible to get access to Bitcoin with Fiat currency or even exchange Bitcoin to Fiat (as the government crackdown will make all centralized exchanges to cease their operations).
Considering that governments want to stay in power, they'll do anything to force people to use their Central Bank Digital Currencies (CBDCs) instead of any other alternative payment system. If that happens, Bitcoin will be doomed.
Do you think that we're close for Bitcoin's End Game to happen? Will it ever happen? What are your thoughts?

I am also concerned that this time will come in the future, knowing that most of the governments wants to have a control over the digital assets that will be use in their respected country. Once the digital payment will fully replace fiat someday, there is a big chance that what you have said will turn into reality.
Once almost all the governments will unite in banning or exchange crypto currencies into their local digital currency, the crypto users will surely face difficulty in cashing out their money from crypto currencies. Once it will happen, the era of crypto currencies will likely to fade slowly but if all the governments will not prohibit the usage of crypto currencies then crypto will be part in the future modernization.