In today's environment, conference expansion must be tied to potential viewership and TV revenue. Northern Iowa, the Dakotas...not gonna do it. Must expand eastward.
I hear what you're saying, but who is left East of the Mississippi? Maybe you somewhow entice Temple to come back as a full member now that they have a travel buddy in UMass, but the American looks pretty strong now keeping Memphis and Tulane plus adding Army. Or you somehow get Delaware out of the C-USA contract?
Outside of the American or C-USA blowing up because of defections to other leagues, who else is even available? The Sun Belt's Grant of Rights doesn't expire until 2031, so you're not going to be able to get Marshall or anyone else out of that.
FCS Schools
Rhode Island - would be a great travel partner for UMass and great for basketball, but they need to make a massive investment in their football stadium: it only seats 6,500 people.
Villanova - I'd love to have them, but the MAC was pretty adamant about adding for all sports when they got UMass. Hard to believe they'd make an exception just for Villanova football.
Albany - again, another small stadium that would need renovated and how much is U-Albany really going to move the needle for this conference? You give Buffalo a partner close by. Yippee.
Holy Cross - probably the one viable option I could see on the East Coast. Private school dollars, a big enough stadium and located in MA for a travel buddy for UMass. Looks like they're going heavy on fundraising recently, but I have no ideas about their desires to transition up to FBS.
Who else is left if you want to go East? I find it hard to believe that North Dakota State wouldn't attract more TV revenue than any of these programs.