Guess it depends on your definition of future, but for the next 3-5 years, yes.
WatchESPN app allows you to watch any ESPN cable channel. However you must have a valid cable/satellite subscription to do so. This includes ESPN3.
ESPN+ is strictly internet streaming content. In theory, these games, shows, etc. will only be available via this app and not on any ESPN broadcast channel.
At least 3 of our games will NOT be available via ESPN+, Grambling, Miss St & Alabama. Haven't seen for sure, but would suspect maybe NMSU won't be either.
Since we only have Saturday games, that leads me to believe that every conference game will be on ESPN+. The only conference games that wouldn't on ESPN+ would be the midweek games that ESPN/ESPN2/ESPNU broadcast.
Clear as mud?