I wonder if some potential candidates (Ken, in particular) are so busy with their own projects that a permanent job on Jeopardy is not a possibility for them.
I did like Mayim on her first shows. She did get more and more giggly as her weeks progressed. Buzzy was also a viable candidate. As much as I wanted LeVar Burton to succeed, he seemed really awkward as guest host, but he would probably win an American Idol style vote in a landslide.