This makes me wonder, will stablecoins replace Fiat currencies in the future? If not, why? Is there a possibility governments will adopt stablecoins as their own instead of launching digital currencies from scratch? Your input will be greatly appreciated. Thanks in advance.

I think stable coins will only replace Fiat currencies once the government has full control over these coins otherwise it will not. The government will not let these coins generated without their regulations hence it is more likely impossible. What will the government do to counterpart this is stable coins is making their own digital money which I think China's CBDC is trying to do. Any crypto coin whether it is stable coins or not this will not remove the fact that this will not replace Fiat, they could coexist yes but replacing each other I don't think so.