This sounds like political posturing and jobs for the boys to me. The idea that you could get an 'independent review' on this is laughable. One of the reviewers says: “Many people have built their careers on EU funding,” he says. If that is curtailed, “it’s a really good use of public money to provide these people with support while they adapt to new ways of working, and not just to dump them”. So it's all about protecting jobs, not research.
I don't think anyone needs to worry about leaving the EU, or not leaving. Whatever did the Romans do for ME/CFS research? Nothing. If anything I think we are better off deciding what to do with our own money ourselves.