I'm enough of a fan of B6 that I use their branded card. This 'basic economy' probably won't affect me since I buy my tickets with the card - and that gives me a free checked bag.
I feel lucky in that I'm near BOS so JetBlue pretty much flies everywhere I want to go, domestically, and looks to be expanding into the international markets I've gone to. Heck, they have a really nice agreement with Hawaiian that allowed me to bring my wife to Hawaii as I had a business trip - and did her ticket entirely on TrueBlue points.