'Jeopardy!' Champ Austin Rogers Says Ken Jennings Earned Right to Be Sole Host

One of the biggest "Jeopardy!" champs of all time says the show is in good hands with Ken Jennings ... but he doesn't want Mayim Bialik to vanish completely. We got Austin Rogers -- who went on a major hot streak in 2017 -- at Gaf East, a bar he…