I think a lot of those that want big corporations to buy BTC and ETH are thinking of two things. One, is the short term gain. They expect BTC to moon because of this and they want to earn a lot from this movement. The second is they think this move will usher in mass adoption of crypto faster. Once more people are introduced to it, more will be accepting of crypto, and it should have a domino effect. For those wanting to keep the decentralization of crypto, they can look at other tokens for that. BTC and ETH are too popular for that to happen. Just think of them as the necessary sacrifice.