it seems to me that the mining model has it "flaws" too since it tends to concentrate mining power with very few (which might be a risk). I understand the incentive of it but .... somehow we end up with centralization. Maybe the future of crypto currencies lies somewhere else unless I have not understood the present situation.
The PoW mining is the best mining scheme. It makes the blockchain more secure than PoS. Bitcoin is not worth 17k because it is scarce, but because it is the safest blockchain ever, a blockchain that can't be hacked. PoS has not yet proven its security model. Wait a couple of years more, when there will be high valued PoS currencies and their security will be tested. Also, something that has not been difficult to create isn't worth much. That's why PoS currencies do not appreciate quickly.
Miners concentrate in a single large pool because this is a new concept and few people know how to configure them. Wait for the first mining pool to be hacked, and everybody will quickly learn how to download and install mining pool software.
You can create your own pool, if you don't like the available pools. The source code is free and available for everyone.
The future of cryptocurrencies is the PoW