If you were to survey our local Fship block players none would say they would quit if we had a Fship block x-list--in fact, just the opposite, provided it was reasonable and small. It may be different with your Fship block players, but I don't see this is some generalizable rule. Indeed, when the first x-list came out, most players I knew were happy with it.
I can see a potential impact on new players because they have to learn what cards can't be used, and their pool is limited, albeit by a small number. But, again, if we're talking about a few cards I can't see it's a problem. Rather, a new player who goes against a hardcore choke deck is just going to be frustrated.
P.S. The point of me personally asking this question is so I can run more tournaments.