Here's the Clemson and FSU source. Yuk.
B1G would have to pay for FSU's and Clemson's buyout...which would be in the hundred of millions PLUS B1G would not be able to televise FSU and Clemson's home games due to GOR. Don't see it happening for the ACC schools.
On a tangential note, when USC and UCLA left the PAC12 I said the B1G was planning to "cut the head" off other conferences. Look at what's going on with the PAC12. If Clemson and FSU leave, it would effectively kill the ACC. That strategy serves several purposes:
1. It kills the competition for the region B1G is trying to penetrate. They have effectively killed the PAC12's control of the West Coast. SEC has pretty much killed the Big 12 competition in the Southwest by taking UT Austin and Oklahoma.
2. It loosens the ties that keep teams together in a conference. ACC did it first with the Big East, and looks like the B1G and SEC will eventually do it with the ACC. B1G tried to take GT from the ACC in 2012, but through some bad decisions (by GT) and strong ties in the ACC, GT remained with the ACC. Well, if the B1G poaches 2 of the ACC's "heads", it loosens the ACC's grip on other targets (GT, UNC, UVA, Miami). Oregon and Washington would sell their kids to go to the B1G now.
3. It heads off any potential lawsuits from the "left out" members in the conferences they're targeting.