Now it is almost impossible to mine #Bitcoin on personal computers. Both the smaller block size and the proof of work are less relevant today for decentralisation.

Some argue well I can keep the full Bitcoin ledger on my PC, how about when mining pools start to blacklist UTXOs?! So we are just getting the disadvantage of an increasingly unusable network with no upside.

Proof of stake if done right can ensure decentralisation and brute force proof, while being actually usable. Lightning is a great solution, but the base layer needs to maintain its usability too.

Bitcoin does not have to move to PoS, but it needs to somehow improve.