Reread what the person I am responding to said. They were calling for a blanket ban of everyone using mods, as in players being permanently removed from the game by Square-Enix. No mention was made of anyone quitting.
I do think you're gravely underestimating the number of people that would quit if mods were somehow defeated, however. Would it be a majority? No, but it would be enough to make the game a good bit less lucrative than it is. ...And considering FFXIV and the mobile games are about the only things keeping SE alive right now, that probably isn't in their best interest.
