I'm not saying Frontier has to go into Memphis and add all kind of capacity to non hub cities, just 2x or 3x daily on an E/190 to Denver.

Memphis lacks non-stop service to the west coast, Examples include SFO, BOI, PDX, ABQ, SAN, SNA, TUS, GEG, SMF, and SBA. All of which Frontier provides connections to through Denver.

I don't see why this isn't enough connecting traffic, in addition to O&D traffic to keep Frontier afloat on this route.