It's surprising! I thought Pat could have gone for a few more years.
I wonder if Pat consulted with Vanna at all, or if she is fuming? Since it took her until noon the next day to tweet about it, maybe he didn't. And her tweet is slightly lacking, no? Since she didn't announce they were leaving together, I'd be really surprised if she goes now.
As for Vanna being the host, I don't know. The 3 weeks she did years ago, she was really robotic, only moving the game along, cracking maybe 1 joke in the entire 3 weeks. Maybe if she practiced, and they got her some joke writers, it could be a possibility. Maybe if they are paying Pat to be a consulting producer, he could feed her some material or give her game show host lessons.