First, let me say I didn't want to go to 14, let alone 16. No offense to anyone here, I just liked it at 12 and I don't like that we're playing Iowa and Wisconsin and Nebraska less because there's more teams in the conference. The best thing about going to 14 was getting a do over on the "Legends and Leaders" debacle. Man, that was terrible. I don't even know which one Ohio State was in.
The B1G will be, and can afford to be, picky when looking for expansion candidates. No, Cincy, Iowa State, UCF, Syracuse, Pitt, Louisville, WVU and NC State are not getting an invite. VT and UConn are probably not realistically candidates either. Kansas could be if they have a good partner, like Oklahoma. They'd both have "State" problems with making a move like that though.
Personally, I want nothing to do with Texas and Notre Dame, even though I think they'd both get in if they were interested. They'd both want special treatment though, which they wouldn't get in the B1G, so screw 'em.
There's really only maximum 8 programs that could potentially get an invite:
Texas*
Kansas
Notre Dame*
UVa
UNC
Georgia Tech
Florida State**
That's it. Missouri MAYBE, but now they're in the SEC I doubt it. The conference won't be going further Northeast because it's a college football deadzone, and they won't/can't be going too far West. If it happens, I'd put money that some combo of UNC, UVa and GT is what you'll see.
*Could probably bring someone along not on the list, just because of the value they'd bring.
**Only included because there are some sources that say they seriously approached the B1G in the past about exploring membership. Probably only as a move to 18 with UVa, UNC and GT.