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Good news for Purdue and the B1G!

Oh, no question.  Rutgers was a terrible addition, for terrible reasons, but at least there were reasons.
Louisville was a 100% desperation add.  The WVU fans I know are still pissed that they were passed over when the ACC added Pitt and Syracuse, because their academics weren't good enough.  Then the Big Ten stole Maryland, they panicked, and went and got Louisville, with worse athletics and academics.  If WVU had waited it out, they'd be in the ACC, which makes way more sense in terms of geography and rivalries, but I also don't blame them for jumping to the Big XII when it seemed like if they didn't, they'd be stuck in the American.

I can't lie; I feel an embarrassing schadenfreudeish joy about how Louisville has fallen on their face in all sports since learning about the grind of competing in a major league conference.  We got jeered and ragged on after the announcement that we were leaving the ACC (actually, we got that treatment for years before that announcement for a variety of reasons); that included a lot of jabs about how our replacement was "better in every way!"
Yeah, I'm petty...

If WV had Louisville's spot in the ACC, who'd have WV's spot in the XII? Louisville?

Cincinnati, perhaps?  I have a lot of WV connections too, and many thought Cincinnati might be eventually added as an Eastern partner for them (although I think that turned out not to have ever been considered).
Many Louisville folks distance themselves from this now, but from what I've heard, when they withdrew from the AAC it was with anticipation that a Big 12 invitation for them was imminent.