What we're gaining, assuming our PCPs are willing to sign us off, is medical certification without the involvement of OKC except in certain cases that are largely spelled out in the legislation. For most of us who have to spend several AMUs a year on medically unnecessary tests to maintain SIs (that are in some cases for conditions we likely don't even really have), that's a big deal.
What might kill this particular goose is the Feinstein amendments and the laying of liability on the physician who signs us off. It may be that even few AMEs will be willing to give the signoff. But all this, of course, remains to be seen.