Campbell
Relaxed Intensity
Eh, could be, but a game you can't find fellow players for is kind of useless except as an intellectual exercise. Its an area I can't help but think the advent of remote play has probably helped with since you don't have to locate everyone locally (though its still a challenge once you move into more obscure systems from what I've heard).
I somewhat agree. Having enough of a player base (or least being able to convince people to play) is important, but a massive player base brings its own issues. You go from finding players being difficult to filtering out who to play with being difficult. It's hard to find players who are specifically looking to play Apocalypse World, but when you do compatibility is likely to be high. It's easy to find 5e players, but finding compatible players can be extremely taxing. That's pretty much why I am willing to play 5e with the right group, but generally do not run it. I find it much easier to find compatible players for games like World Without Number and Pathfinder Second Edition.
In a match making market oversaturation is just as much of an issue as sparseness.