Tech isn't that great a place to coach IMO. Besides the limited resources, it's no longer the #3 school in the state. I think Baylor, with RG3's Heisman, Art Briles contract extension, and the new stadium has surpassed Tech. I also think TCU, which is now in the Big XII, has passed Tech. So Tech is just not that great a place to coach because recruiting wise, it is less desirable. Lubbock isn't great either, and I know that neither Tuberville nor the Tech community embraced each other, so it's probably for the best.
The move makes sense for Tuberville and Tech can find a coach that better fits them.