General,
You are correct, we can't compete with JetBlue on the pay rates. You can't either. On top of that your present infrastructure helps to make you less competitive. That is not your fault.
Let us not forget however, it was ALPA that first low-balled the EMB170 product, not JB. It was not regional pilots that did it, it was mainline pilots at USAirways. Can you name anyone that has lower rates for that equipment than MDA? Remember, the matched the Eagle contract, but they gave up 100% of their longevity, thus putting them all at 1st year pay. You can bet that the JBlue decision was based on that. As far as I know, there are no 1st yr capt's flying 70-seat jets at any regional carrier.
If Delta pilots want to give up their longevity to get a 90-seat airplane, go for it. The $89 JB pay that you quote for the EMB-190 applies to a 12 yr. Capt. Don't forget that JB hasn't even existed for 6 years so there will be no one at that pay rate. Virtually all of their EMB-190 capts can be expected to be pretty close to 1st year pay, which is $71 at present. That's not a pretty picture. Not for you, not for us, not for anyone.
As far as I know, only Mesa has lower pay for a 12 yr Capt in the CRJ-900 = $82. Also courtesy of ALPA. I do not envy your efforts.