I wouldn't say they "don't have interest". And playing Marshall, UNLV, Boston College, Syracuse and even Cal (like they do this year) isn't exactly helping their "national appeal" either. Heck, even having North Carolina, BYU and Navy isn't really "must see TV" though slightly better in the name recognition department. Playing 3-4 games against some combination of Ohio State, Michigan, Penn State, USC, Nebraska and UCLA is going to be at least an even trade and probably an upgrade over what they have now.
They are already (potentially) handicapped by the format of an expanded playoff. Though they still seemed to be fine with that.
They would rather be independent but it will come down to money. If they can get the same TV payout, they'll likely stay independent. But if not - and thus, fall behind from a competitive standpoint - they'll look pretty hard at joining a conference.