It wouldn't be considered Bitcoin anymore though, since the coin cap violates one of the few goals that Bitcoin is trying to achieve.
That's when the fork comes, they are modifying everything according to what they believe that's right. Everyone that will hear a person that wants to increase the supply limit will mostly be ignored. We do believe already that 21 Million supply is a good number and we can't argue with it anymore. And mining the total supply limit of
BTC will take time, so we're all dead by that time - assumed year (2140).