Chip,
There is little to no incentive for either Skywest or ACA to join as US Airways affiliate regionals. Why would their pilots want to agree to JFJ or their managements agree to join with US Airways if they could both shift operations into their established Delta Connection code shares?
I know that you are eager to see an actual JFJ operation take place, but that is just grasping at straws. The fact is that it is a crappy deal that could only have been forced upon regionals without a choice (ALG, PDT, PSA), or those about to expire (Midway, CCAir).
JFJ is not a new idea, just because a few carriers have been forced into the deal does not make it anymore enticing to anyone than when it first was introduced...
You will get your JFJ, but it will take a long time before it makes any real impact.