So now we're going to change the block structure, the network protocol, the consensus mechanism, miners' role in the process, AND the proof of work? And you still think this unrecognizable Frankenmonster will be "the real bitcoin"? Dream on.
Every time reality strikes, there is another proposal to change things. Core can write all the code they want, it still won't change the facts on the ground:
People aren't drinking the Koolaid.
Nobody is going to change miners role. Their role is to provide consensus on the state of the ledger, on order of transactions.
Nobody is going to change the consensus mechanism. Chain with most accumulated PoW wins, provided that it's a
valid chain.
PoW change is the last resort option, hopefully it won't be needed.
It's up to users to choose validity rules for blocks and transactions. It's that simple.