Even in this case, centralization will happen, because someone will just buy a whole bunch of machines and stuff them in a warehouse. Yes, everyone that can afford a desktop unit can be a miner, but the big guys will do the same thing. And there will always be pools.
A thousand times this ^^
If there is
any conceivable way to scale mining of a coin
and revenues generated by mining outweigh the expenses, then 10/10 times mining power will be consolidated over time. You can pick any coin, any algorithm, any hardware specification, it doesn't matter...if it's profitable and it scales, it'll go in a datacenter. There hasn't been a feasible way around this, since really it's just economics.