I heard the experts on XM84 speaking of the chances of UH getting into the Big XII. They thought somewhere between zero and nada. The heads opined that (although none would ever admit) the Texas schools would block Houston's membership because the city is such a fertile recruiting ground that gets poached frequently. If UH was in the league, they would begin to retain a lot more of the talent available in that city.
The second reason the Big XII doesn't need UH is because they already have the market wrapped up with all the BU, UT, TCU & TT alumni that reside there.
UH to the ACC makes a lot more sense if they can ever make the jump, since geography means absolutely zero any more.