I'm one of the fortunate people to have a semi- regular gaming group, focus on the semi part. Usually we play something once a week, but sometimes life happens and we can't meet up. It would be amazing to be able to have an app that can be used alongside the board game (as we have here) AND a standalone app game that we can all play together. Kind of like a play by post, but much more supported and encompassing.
That's something I'd easily pay for. It doesn't even have to be Cthulu mythos related. It could be Descent, or any licenses FFG has. Just a turn by turn play app that simulates some of these games or at least close to it.