Increasing the bitcoin supply is a terrible idea and I do not expect it to be proposed and passed under any circumstances. Although supply is not the only factor that makes bitcoin as valuable as it is today, and many people are also focusing too much on bitcoin's supply, because if bitcoin does not have any outstanding utility, then that supply is worthless. But we should not arbitrarily change or increase supply because if you change it once, it will happen next time. This will reduce the reputation of bitcoin thereby reducing the value it achieves.
For people who are Bitcoiners and already joined Bitcoin community, it does not make sense to increase total supply.
For outsiders, who dislike Bitcoin or hesitated to join Bitcoin community, they want to see total supply increase with some reasons. One can be their hope to see cheaper price for 1
BTC to enter. Another reason is simply because they dislike Bitcoin and want to see its price to fall.
So as insiders, we have no reason to satisfy outsiders because of their benefits or just because they want to destroy Bitcoin value and price.