If I were the B1G, I’d try to undermine the ACC. UNC, UVA, Pitt, Ga Tech, Duke
would all be much better fits in the B1G than UW, UO, Cal, or Stanford. Because of the geographic isolation, the West Coast schools aren't going anywhere, but the same can't be said about the more valuable ACC properties. I'm sure UNC and UVA would prefer the B1G, but if the SEC comes knocking, they aren't going to say no.
That said, I'm resigned to the fact that the B1G is going to add West Coast teams that won't interest me as a fan of a B1G school.