If that's what you think, ok then. But you can't replace these consensus with what you are believing but if you have a better proposal to change these algos into the consensus algorithm that you know which is safer and more secured, you can give that proposal or make it happen.
Yes, I actually have. A hybrid Proof-of-Replication, Proof-of-Retrieval and Proof-of-Stake would be better because Proof-of-Replication and Proof-of-Retrieval are used for validating any data. Not only value transactions.
Did you invented all of that? where can we find the description and explanation for those consensus'?
Mining top coins are not that cost-effective
Actually they are. Mine bitcoin, you'll need to spend a lot of money from thousands to tens of thousands for you to have a profitable mining experience.
mining a coin early which we believe will have a great future is a whole different game.
but in case of PoS you need money to make money.
The same with PoW, you can mine those worthless PoW coins but they don't have value but mining those profitable and worth it PoW coins, requires you decent capital.