I don't know whether governments will buy Bitcoin, but I wouldn't consider it unlikely that some country decides to use crypto as a replacement to their fiat currency -- either the government of a developed nation does it, or the people just decide that their local money isn't worth the paper it's printed on, and decide to use some sort of cryptocurrency.

I know this sounds crazy, and I would've called it a ridiculous notion if someone told me this 5 years ago, but I don't consider it too unlikely anymore. It has grown on me.

Due to quantitative easing, money just isn't worth much anymore and asset prices have gone up a lot across the board. Just look at the recent acquisition of a painting by Leonardo da Vinci: $450m. That could not have happened 20 years ago.

BTC would really need the support of a developed government, but those governments aren't eager to give up control of their currency.

I don't think Bitcoin is a currency anyway.

Building a crypto banking service that can be controlled through a phone (e.g. in Africa) should have tremendous value given the very high inflation in some countries there.