Big East has nine D1 soccer teams in Top 100 RPI, and 11 current member schools. That would be quite the impressive conference, with Akron being a natural geographic fit in the west of the conference, alongside Xavier, Butler, DePaul, Marquette, and Creighton.
I bet that the MVC or Horizon League would be happy to welcome NIU, Chicago St, WMU and BGSU. Western and Bowling Green both would likely win either one of those conferences.
The only independents this year the MAC could pick up is UIW and Hartford, neither of which make much sense for the conference - this year more than most others is probably the right year to dissolve MAC Men's soccer.