I just don't see Texas going to the Big10. They have it made in the B12, getting the largest share of pro-rated TV dollars. What's more, the league is top heavy at the top and there are some really weak sisters in the bottom half of the league. Going to a 16 team B10 that includes OSU, PSU, Michigan, ND, Wisconsin, Nebraska seems to be making your path to a BCS bowl game every year too difficult. What's more, I am sure the folks at OSU and Michigan aren't too happy about this as to them-- the B10 is OSU and Michigan. There is no room for anyone else.
What's more, Texas to the B10 sounds great for football and basketball, but I can't see anyone being to excited down in Texas about going to the women's softball game up in Minnesota or Wisconsin in March.
Texas stays in the B12 IMHO.