Ken Jennings is the clear choice.
Watson.
I just find it sad that Trebek is being written off already. He’s still alive and fighting, FFS! 
Hell, why not just go with David Mitchell?
Not to thread-shit, but I think any intelligent, well-spoken, well groomed person would be fine. I like having a host — I wouldn’t want an empty lectern and someone reading the answers off-stage — but the amount of personality that the person needs to display is minimal. Better too little than too much.
Too little personality is much, much better than too much.
Jeopardy isn’t Family Feud where the interactions between the families and the host is part of the fun.
I think I’d like a woman this time, just for variety.
Someone who can make the little interview segments less cringeworthy. Or someone who can persuade the show executives to eliminate those segments entirely. Really, does anyone care about any of that, other than the person and their family? I had to give up watching a long time ago because the combination of amateurs trying to tell something about themselves, and Trebek’s heavy-handed attempts at, well, talking like a person just drove me away.
Aisha Tyler would be a good choice. I think she did a nice job hosting her short-lived panel show on AMC last year. She’s obviously very smart, and she can be serious or funny as the situation warrants. Plus, she’s much hotter than Trebek.
I think I like this idea the best so far. Though Andy Richter would awesome.
And often as not one-upping the contestant’s interesting little fact about themselves.
I won’t post here again, lest I piss someone off like I did in an earlier thread (unintentionally).
But, I want to second the motion to have a woman assume Trebek’s spot, when the time comes.
Anna Roisman. Love her on HQ Words.
Of all the above, I like Ken Jennings the best.
Let’s be honest, Jeopardy is just an announcing job. On each individual show there’s not much room to be creative. We like Alex because he’s been on forever and over the years his personality has come out in 10 second increments. It might be a good payday for her but Aisha Tyler’s talents in improv and stand up would be totally wasted. The main qualifications for the job are just to be able to read the questions and get through all of them in the time allowed.
Ashley Judd.
My ideal host would be Jimmy Kimmel, based on how well he did as the questioner/straight man on Win Ben Stein’s Money. I don’t think he’s available, though.
It wouldn’t kill me to see Ken Jennings.
I agree. I watch Jeopardy to try to answer the clues. The perfect host is someone who knows the audience is there for the game, not for him (or her).
There was a discussion here (I think) about who would be a good host of an American version of QI, and I thought of Hunt. That’s a hosting gig that requires intelligence and wit, and I still think she’d be great at it. I think her talents would be a bit wasted on Jeopardy, though.
I’ve been thinking about this for quite some time, and the problem is, you need someone really smart. Someone that you could picture knowing the answer without looking at the card. Heck, someone who could have written the clues and created the categories.
So, Meredith or Ken might work.
But I’ve also been thinking of smart entertainers. But the best ones are from the deep, dark past: Steve Allen, Jack Paar, Hugh Downs… Hey, where’s Dick Cavett when we need… no, he’d smirk when someone made a mistake: “Pfft, really, Marcia? The Colossus of Rhodes? (Sigh) I’m sure if we gave you another chance you’d get… well, at least closer.” (Glance at audience)
Joshua (Computer in Wargames)
All it wanted to do is a play a game.
It has to be somebody that looks like know all the answers better than the contestants, like Alex.
Austin Rogers.
Or if he doesn’t want to quit his day (night) job, Wolf Blitzer. 