Speaking from my PHX perspective as well as a F/A/Y/B fare traveller(95% of the time) I would love to see mainline on the ORD-PHX route, however for SFO and DEN I am completely content with TED. The flights aren't longer than 2 hours and the extra capacity really helps. There are many times I see Y2 or Y1 and end up selling out a flight. I'd much rather not have to use my guaranteed seat benefit every week...