Sajak's appeal was that the show wasn't about him. Most of the listed hosts put themselves first as the "star" and the guests are props.
Vanna White could do it (and they don't need to replace her at the board), but she's close to retirement age, too.
They'd be better off looking for a fresh face, someone who's unknown or a local news talent.
-PJ
You're correct about 98%. But Pat's little low-key one-liners are one of my favorite "things" on the show. Whether rehearsed (not sure how they could do that), or they just roll naturally out of his mouth...he cracks me up. That will be difficult to replace.