Won't happen unless there's that type of symbiotic relationship between the NFL team and the MLS team like they have in Seattle and the Cardinals have no interest.
I know with the ownership of the Cardinals it will never happen unless it benefits them 100% and the MLS team 0%.
I have pictures from the event as well. http://s86.photobucket.com/albums/k116/KeatonBKoch/AO/ I feel like there were more AOTucson members at the game than AOPHX. Same with the Friday night party. Don't know why. Anyways, hopefully US Soccer took notice of the PRO-US Crowd and will put a World Cup qualifier in AZ. Plus we're undefeated in Arizona.
If anyone wants, I have a good 50 pictures from the training session, tailgate, and game, so if any of you want to see them, I'm willing to take the time to upload and post them.