“will transition to decentralized”, “most likely”, because we can always trust people to give up their vast power and wealth voluntarily right?

Or you could use Bitcoin. Which has been decentralized and reliable for 15 years and doesn’t suffer from inevitably increasing centralization like every proof-of-stake coin does. And doesn’t have massive requirements to run a full node/validator, which inherently increases centralization. Scaling crypto requires adding layers on top of the base layer, not making the base layer so huge you need a server farm to run a full node. Lightning scaled Bitcoin to essentially an infinite number of transactions per second without increasing the chain size.