I believe there are a lot of people who honestly don't know there was Jeopardy before Alex Trebek. Alex made the show a piece of Americana the way Bob Barker did for The Price Is Right. It can continue, with the right replacement host.
The problem is, even more so than Barker &
The Price is Right, the kind of influence Alex had on the show, the next host will be expected to fill a role unlike most any other game show. When Pat Sajak finally leaves
Wheel of Fortune, they can literally put anyone from Mellissa McCarthy to Dana Carvey in as host.
Jeopardy, on the other hand, is not the kind of spot you can plug any old standup comedian or talk show host into, imho, without damaging or weakening the brand
They'll have to be seen as a likeable intellect. They'll have to have impeccable vocal performance skills, & a warm but almost formal charisma in comparison to most shows, unless they plan to reformat it to fit their new pick, which I believe would be ill advised. Alex had a better presence than most of today's news broadcasters do.
The difficulty is in the fact that most people who might fit that description are likely going to feel like hosting a game show is beneath them. Frankly, if I didn't feel like it would be an enormous waste of his abilities as a scientist, I'd want someone like Neil deGrasse Tyson to host a show like
Jeopardy, but that is ultimately highly unrealistic.
Realistically, I'd be ok with LeVar Burton. He has the elements to make it work imho. I'd probably feel the same way about Dennis Haysbert. It would be a better use of his skills than Allstate commercials at least. A rather foreboding gut feeling of mine tells me that we'll get no one near as good as that though