Greedy corporations and governments only want to get rich holding Bitcoin in the long run. They don't care about its vision for decentralizing the economy. You're right that it's all about FOMO. I mean, why would companies miss the opportunity of a lifetime to multiply their investment with Bitcoin? And governments? They wouldn't want to miss the huge taxation benefits BTC provides. It's all about money, power, and control.
Don't expect the hype to end anytime soon. Not as long as BTC remains smaller than Gold in terms of market cap. Once everyone is on-board and Bitcoin replaces Gold as the world's ideal store of value, that's when the craze will end (ultimately resulting in relatively-stable market prices). Hopefully, most of the BTC stays in the hands of the people. NOT large companies/entities or governments. Only time will tell us what will happen with it.
I agree with you that these greedy corporations and governments want to get rich but why didn't they adopt Bitcoin before when they had a mega chance of skyrocketing their financial values? I think that at first they were fighting Bitcoin and when they saw that this fight was pointless and also late, they decided to change the gameplan and integrate Bitcoin instead of kicking it out. If you can't beat them, join them. This is their strategy.
Btw I also hope that most of the coins stay in the hands of the people. In the past, I wasn't advocating for holding Bitcoin because it has to be in circulation in order to be it active, popular and usable but now since the Bitcoin is becoming a store of value and governments and big organizations want to acquire all the coins, we should hold these coins tight in our hands.