How about hedge funds contact core devs and tell them: "guys, in order to make this thing would-wide spread we need a controlled inflation: we need to remove "halving". Lets say for solving a block it will always be N number of coins. You guys will be rich, famous and your names will be written in history forever. From our side we guarantee at least 51% of mining power with the updated bitcoin protocol where there is no 21M limitation anymore. The garage miners could stick to the old protocol or whatever - their old bitcoins are useless".
I think this is very possible if we are talking about wide adoption of bitcoin.
They will be rich and famous either way when mass adoption comes. The only realistic possibility of this kind of change might be a POS protocol to keep it around 21 million in circulation but this would be 50-60 years away at least.
Keeping always N number of coins (like 21M) in circulation is possible: coins will always been lost due to lost passwords, hodler dies, etc, etc
That is why I can foresee some way to keep a controlled number of new coins in existence. The currency will inevitably have coins permanently lost over the years and eventually become so rare that it isn't really fungible anymore.