I didn't read the replies, but at any rate, I do DEFINITELY think JetBlue could be every bit as good, if not better, than Southwest.
HOWEVER, it will take time!
Rigth now, no, right now they need to take expansion slow, meticulously calculate their every move. The market is not very good right now and a screw-up could land them in Midway's situation, which I think is not wanted by the majority, especially me, because I love JEtBlue to death!
Their main advantage over Southwest is the:
1) Comfort, more comfortable than a southwest seat
2) PTVs. Inflight entertainment right at your nose is always a plus, however, the thing I LOVE about Southwest is "THEIR" form of inflight entertainment, jokes are always great!
3) You can BOOK the SEAT you WANT! That is a big plus over having to fight for your seat!
However, before anyone feels offended, Southwest is my favorite mainland airline, it really is. But, as with any airline, I do see a few flaws, and I also love jetblue and can say that Jetblue could be every bit as good as southwest, as long as their careful and don't do anything stupid!