The first two year of the Mountain West football title game were on over-the-air CBS, but the network was only contractually obligated to air the title game for the 2013 and 2014 seasons. At the Mountain West spring meetings in Phoenix, the network elected to not pick up the option to air the championship game in 2015.
CBS could still be the ultimate home but they are no longer hosting the title game at this time. Part of the reason that CBS likely failed to pick up the option is because of the late 10 p.m. ET kick off time and thus ratings would not be great. The only other option would be to play the title game at 12 p..m. ET and that idea was not going to fly with the schools. The SEC takes precedent on that championship Saturday and making time slots limited for the Mountain West.
ESPN might come in and pick up the title game since they are a key television partner and maybe even CBS Sports Network, but having the game on a channel that is on a higher tier is not good for business.
Currently, the Pac-12 and MAC will host their conference title games on Friday night, so there is room for the Mountain West, but they could be either competing head-to-head with the Pac-12 or have an undesirable 10 p.m. ET or later kick off.
On Saturday there are five other conference title games, including the new championship game for the American Athletic Conference. Time slots will be limited but the league might be able to work out a deal to kick off before 8:30 p.m. ET. Kick times are not set for these conference title games but a wild card could be that Fox, Fox Sports 1 or maybe previous rights-holder NBCSN would be interested.