The Big10 doesn't need to pull numbers "if." Doubling/tripling up on a market (southern New Jersey is in the Philly DMA) loses the Big10 money, and that's what Temple would do. Blocking the ACC isn't what the Big10 needs. If the ACC wants to add Temple, more power to them. Temple brings very little to the table, though. If bundle subscriptions are still a thing in 2019, they have Pitt (and power of ESPN) in the state of Pennsylvania to "encourage" cable companies to add the ACCN.
Blocking the ACC is a move that would be detrimental in both the short and long run. If the school isn't right for the Big10, doesn't add money, viewers or more exposure, than why bring them in? Once you add a school, they are part of your conference for a very long time. Yes, I understand that Rutgers was add, but they are the state university in a state that has 9 million people, is part of the largest and fourth largest DMA and is a pretty good research school. They are the only FBS school playing football (if you can call it that football) in the NYC DMA. Athletically, they are a mess. Financially, they are a boon for the Big10. Temple is none of those.