Whatever it is that the economic majority thinks is more important. If it is sticking with the existing miner fleet, that's where the value ends up. If it is firing the existing miner fleet, that's where the value ends up. There is no answer you or I can state without that information that is more correct than another.
OK. But note that the Core devs cannot "fire the miners", just as I cannot fire the Core devs or the miners. They have no power to stop or hamper the CartelCoin, nor the OldCoin. All they can do is what I can do create the CoreCoin (or StolfiCoin) and hope that people will use it. They cannot even ask people to choose between the two: each client will start with the same coins on each branch, and can move them independently.
I never mentioned the Core devs.