Whatever its worth...
Virginia's vote was necessary to obtain the 75% majority. Duke & UNC were hard nos. That gave Virginia the swing vote (they had voted yes initially to pursue expansion and then changed when it became public that Virginia Tech was not being pursued) and the state legislature put pressure on them to force them to vote against expansion, if Virginia Tech was not included.
Virginia Will Not Vote 'Yes' For ACC (Washington Post - 6/17/2003)
Once Virginia Tech was added by the ACC, they dropped out of the lawsuit (with the Virginia AG bragging that the lawsuit slowed things enough to get Tech in "The reason Tech wanted to sue from the beginning was to remain in a strong and viable conference,'' Kilgore said. "Virginia Tech has long wanted to be part of the Atlantic Coast Conference. And that's becoming a reality now.''.
Even Without Virginia Tech Lawsuit Still On (AP via ESPN.com - 6/25/2003) Virginia Tech was the tax the ACC had to pay to get Miami, making the lawsuit irrelevant.
Boston College was then dropped from the lawsuit when they didn't get in initially, only to be then sued again in October when they ended up getting the 12th spot. Both lawsuits were consolidated & eventually the ACC (and Swofford, et al) was dismissed due to lack of jurisdiction in CT, but the suits against Miami, Boston College & DeFillippo continued before being settled for about $5M; $1M of which served as BC's exit fee, another $1M to each of the 4 plaintiffs (UConn, Rutgers, WVU & Pitt) as well as home & home series in football (that's how UConn got the UVA home & home).
Big East settles lawsuit (AP via ESPN.com - 5/3/2005)
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My opinion, the lawsuit was foolish & certainly political grandstanding by Blumenthal; but BC wouldn't have been pro-UConn with or without the lawsuit in 2011. Furthermore in 2011 the lawsuit had to be a non-issue as both Pitt & UConn (or even WVU or Rutgers) were the two viable candidates (outside of Syracuse) and both had been plaintiffs. UConn's issue was Boston College's fear that elevating UConn would crush them (rather than giving them a rival to spur interest) and the ability of the ACC to find an alternative palatable to their membership & ESPN.
I also do not think that UConn's chances in 2012 would've been enhanced without the lawsuit. Miami was going to be pro-football (and therefore pro-Louisville) with or without Shalala being willing to take the call directly from Herbst... it came down to football or basketball. Football carried the day. UConn needed more from Manuel than monitoring things from the Virgin Islands to reassure the ACC how serious it was about football (which at that point hadn't become a trainwreck) & that it had a plan in place for Calhoun's successor. Manuel wasn't up to the task, while Jurich was, and he managed to push the athletic success enough to help the ACC Presidents hold their nose to take in Louisville.
I absolutely think there were hard feelings from DeFilippo & Shalala... however in the end I don't think those hard feelings materially changed the calculus, in either expansion decision, it just might have made those people feel a little better that UConn was going to miss out.