I don't doubt it has not hurt the conference, what I am skeptical about is that the inclusion of Rutgers has benefitted the conference enough, that the big 12 would look at them, and think it is a good idea to prioritize a Uconn over a Duke for example. Or even a UConn over an NC State.What Rutgers has provided is the Big 10 Network inclusion in NY area cable outlets, etc. Rutgers inclusion has not hurt the conference at all, anything resembling a dial mover, certainly not.
Though this is a tricky conversation because schools with solid football are obviously graded on a huge curve in terms of viability
The other thing that breaks my brain when discussing this topic, is I am used to there being some sort of limit to how many schools can be in a conference. Those days seem over. Whats stopping the big 12 from poaching half of the ACC, and then poaching half of the Big East as a basketball only division? With Uconn being the lucky school from the BE that gets a piece of the football money too