There is ZERO chance the merger results in an AQ bid. I looked into this a year or so ago, and for AQ status the BCS essentially looks at the AVERAGE football ranking in the conference. When two conferences merge like this, the average stays the same. Therefore two non AQ conferences merging will do absolutely nothing into turning the merged conference into an AQ one. Unless they do something like kick out the bottom third of the schools after the merger, I suppose. That would probably do it.
When I did the calculation a year or two ago, I learned that even if Utah, BYU, and TCU had all stayed put, Boise State joining the MWC would not have pushed it over the AQ edge. There were just too many "dogs" in the conference. I was really surprised by that, but I used the same calculation the BCS uses. (Can't remember right now the full details of the calculation and don't want to take the time to google it, sorry.)
You are not considering all of the variables here. I think there is a very good chance this new conference gets a BCS game, and here is why.
The MWC and CUSA hired a consultant to get them a BCS game. He recommended they merge, or at least agree to a championship game between those 2 conferences.
This consultant was then hired by the Big 12 and is currently their new commissioner. He has publicly stated that he is still working with the MWC and CUSA, and is committed to getting them a BCS game.
The Big 12 is looking to expand, this is no secret. The Big East is on the verge of collapse, this is also no secret. The Big 12 is looking at possibly adding several Big East teams, and already added TCU.
If the Big East collapses, their BCS game will have to find a new conference to be affiliated with.
It's not a stretch to think the Big 12 commissioner will try to make this happen. He has already publicly stated that he remains committed to getting the MWC and CUSA a BCS game, they are still following his plan, and he is in a position to finish the job now by killing the Big East while simultaneously saving the Big 12.
I honestly think BYU to the Big 12 died the day this guy was hired. I think he planned all along to invite Big East teams, for the reasons listed. Plus, with super conferences on the horizon, killing the Big East right now helps the long term stability of the Big 12.
I read last year that the WAC would no longer be a conference under NCAA rules if they had fewer than 6 teams that were in the conference the previous year. I doubt the rules are different for the Big East. And as of this moment, the Big East only has 6 teams that haven't announced they are leaving.
The Big 12 is rumored to be looking at adding 2 or 3 Big East teams, but they probably only need to add 1 to kill the Big East (which would give the MWC/CUSA a BCS game).