Either they get their act together or they don't (leaning toward don't I see, but that's besides the point). Most of their concerts have sold out, I don't think that public interest is the problem. If they did make a new album, it would sell as much as it can in the current market, but it wouldn't go unnoticed just because the times are changing or whatever. The Eagles just released a new album less than 10 years ago and it went to #1, no doubt in my mind FM can do the same.
But that would involve the the 5 of them together actually working as a 5 piece and that's probably never gonna happen.