This would require a hardfork and thus require everyone in the BTC ecosystem to agree to swap to the new consensus rules. Blockstream has spent years blocking hardforks. Wont happen.
I agree they've spend a long time blocking hardforks but I worry they have the BTC ecosystem wrapped around their finger & can change the ecosystem sentiment on a whim.
I say this as someone who gets BTC community sentiment through r/bitcoin which is wholly manipulated. So I dont think I (or maybe anyone) can judge BTC comm sentiment well.
If the chain freezes the panic sellers will kill the chain before a fork can reach consensus. Remember each exchange and merchant also has to adopt the new consensus rules.