I agree with you, miner centralization sucks. However it's a problem if miners 1) attack the network 51% or 2) censor transactions.

I haven't seen any evidence of either.

And ultimately... what's the alternative?

In my opinion the centralization issue won't really be addressed until people go out and spend their Bitcoin, pay the miners lots, and make more MoE. Which won't happen until we have better education which is the most important thing.