Then the world would laugh and quietly ignore such nonsense.
But worry not, such craziness won't occur. It's not under anyone's control except consensus of the community.
Even if the core devs vote to remove the 21M limit, it still won't make it so.
hopefully it will not happen, but if what happened was bad possibilities that will arise.
Unlikely to happen. If it does, bitcoin holders can just sell it off to move to another coin.