Yes, that's what it looks like.
The last episode of Medium was a bit of a shocker, with Joe refusing to support Alison when she needed him so badly. That was a terrible ordeal for her, not being able to understand anything anyone said. But that's the moment he chose to get fed up with the whole "medium" thing. He was even tempted by that doctor who came on to him in the hospital. That's not the Joe I've been watching for years.