The 3 biggest football brands by far are FSU, Clemson, and VT. The B1G and SEC are not interested at all in FSU and Clemson. Therefore, it really doesn't matter which 4 teams get poached the ACC could simply add UConn and Cincy and remain as a very viable 12 team football conference (especially with their ND agreement) and the top ranked basketball conference in the country.
I just can't see FSU and Clemson wanting to be Texas' slave when the money and bowl access will be similar in the ACC, and the basketball and academics are superior.