I think the Sajak stuff was more of a joke than reality. Or a combination of wishful thinking and something that would be interesting while falling in the line of "no chance it's happening".
I think the reason why Pat was brought up in the first place was just to compare where Drew would stand in terms of the record for the longest tenured host with one show, when Carey is done with Price.
Rachel as the host would be pretty neat to see. As mentioned, she has been there for a couple decades & has a great relationship with the staff. I wouldn't bet one way or another right now, but I agree it's an interesting thought. Say Drew called it quits in a decade. She would be at the perfect age to host if the opportunity was there. However, I imagine she might be too involved with her family to have the time to commit