The bitcoin community didn't agree to increase even the block size which created multiple forked coins till date. So I can assume it is next to impossible for the community to agree on the supply increase. Also scarcity is the beauty of bitcoin to be honest. Many people have invested heavily into bitcoin mining to earn their share into the 21 million coins. If the supply suddenly increases, this is going to create a chaos and a drastic price drop. It will be a total mess. So I don't see such proposal is getting a green light from the network participants anytime sooner or later.