Yes, I believe it would take at least 2 more schools to MVB as a B1G sport. It was 6 schools for hockey. It might be possible to have a MVB only participant like ND for hockey or John's Hopkins in lacrosse.Only PSU and Ohio St.
With UCLA and USC on the way. There would need to be more schools with programs before it could be a conference sport. Even after adding the CA schools to the B1G, I expect we would still be in the EIVA and UCLA/USC will stay where they are now.