I don't really get your point here as you don't have to buy ASICs every X years with PoW consensus. A friend of mine mines with his 3070 in a mining pool and makes a small plus with it. Hell, you can even mine with a 7 year old PC. Will you ever find a block? Probably not, but you're still securing the network and may get lucky. I don't see how this incentivizes centralization any more than PoS. With PoS, you have to be part of the network by spending money on a token while with PoW, you just need an existing PC with some compute power.