This totally affects my loyalty to DL as a PM. Without the opportunity for T-con upgrades - my route is primarily JFK/Cali - there is simply no value for me to direct all my business to DL. At least with SWUs and the smart booking I could get BE occasionally. Now, I'll just shop around for the best price/class ratio, especially with B6 Mint coming.
I have to say though, its liberating not to feel loyal to DL anymore. Now when flying to asia in J I can look at the best option rather than focus only on a DL routing.