I guess you could if you wanted to jump through some hoops, but the priorities of a lot of schools would have to change (chiefly UConn, but also Butler), they'd likely have to add a 12th school (Dayton?), and I'm not convinced a mediocre FCS conference would be viewed as a positive thing for the Big East from a brand standpoint. But the landscape is still changing in FCS, so maybe it'll make more sense at some point in the next few years.