The ultimate consideration for Nebraska was what would happen if it stayed in the Big 12. The most likely scenario was that others were (are) likely to move elsewhere, leaving NU holding the bag.
This is a great opportunity for both NU and the Big 10. A classic win-win.
Personally, I am looking forward to it. It has been many years ago in some cases, but I have broadcast games at all the Big 10 schools. It'll be nice to do it again.