Well, there's the relevant XKCD. Things can be popular/non-niche, yet plenty of people still don't know about them.
M&B is not a household name, but being 'niche' also sounds like much too strong of a word to me. Idk. Czech point-and-click games are niche, traditional roguelikes (NetHack, etc.) are niche... by my metrics, at least.
