I think that depends a lot of how exactly a group is set up. A drop in/out club game seems likely to launch games, even if it means having a lower than normal party size. OTOH, a friends type group may not want to essentially kick someone out every other week for months, and may not be able to schedule an additional game.I don't buy this idea that the loss of one player will prevent a group from playing a game that everyone else wants to play..
So then it is basically is a matter of not RPGing, versus one person either sacrificing a lot by playing in a game they probably won't like sometimes versus everyone else always sacrificing a little to accommodate them.
It'd be novel to just see what I, and other people, really want instead of needing to guess at it.I sometimes hear people on forums talk about having or needing contracts for RPG groups. That always sounded strange to me. But if the contracts required everyone to specify their utility functions I might get on board with that. For the novelty if nothing else.