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.
Bitcoin Foundation would never do such a disruptive thing.
Anyways, you would need to fork bitcoin, and you cant do that without atleast 51% hashrate, therefore bitcoin foundation alone cant do any major things without comunity backing that up.
cheers
A hard fork can be done with any amount of hashing. You don't need 51%. You are confused.