The net number doesn't appear to publicly exist on its own and I'm not looking any deeper. That is why I'm trying to back into it. As I said, I have neither the time nor inclination to do your research. I will buy your TV contract point only because it is reasonable on its face according to the math ($10.8 Billion / 14 = $771,000/yr). That said, and Football being the only other revenue generating sport, Football contributes in the neighborhood of $40 Million/year. But the NCAA's revenue streams do not exist in a vacuum either.
Now that you bring up the TV Contract, there is a specific clause that says
the NCAA will not amend its rules in any of a series of ways "to the extent such amendment causes a material adverse effect on Broadcaster." "...and, in a phrasing that is not completed because of omitted pages, "the creation of another postseason Division I men's basketball tournament that materially diminishes the status" ... I think the P5 breaking off from the NCAA in a manner that member schools may no longer be in the Tournament adversely affects the Broadcaster.
Hypothetically, say the p5 segregates itself in football only. How does the NCAA allows them back under the umbrella for other sports including basketball? The NCAA becomes a paper tiger slaving to the whim of the P5. It is a slippery slope from there to other institutions outright ignoring their "governing body" because there are 2 different explicitly stated sets of rules for these 65 arbitrarily thrown together teams vs. the other 1100 universities (Oh yeah, we're still talking about not-for-profit institutions of higher learning, no?).
So there goes that $40 Million plus a severely negative renegotiation to the Basketball Tournament contract.
If anything truly significant is to happen, I foresee a bevy of anti-trust suits coming to pass. It's a bad time for College sports, regardless if UConn is invited to the Big Ten or ACC).