The best shot the "Group of 5" have at a FBS playoffs is if or when the college football playoff is expanded to 8 teams from 4. Only then could I see this happening.
The problem UConn will have is many of the top 5 conferences have now gone to 9 game conference schedules, leaving just 3 non conference games. Many play one non conference rival or schedule a made for TV neutral site game, with the other two games being 'buy games'.
Very hard right now for an independent to fill up a schedule.
Gonzaga is able to continually play hoops at a high level and get national exposure, UConn should be able to do the same.