It is certainly the case that the show will sag in popularity if Ken is not given some stronger challengers. Yours is a good idea.
Another poster suggests that others have done as well as Ken. I have watched fairly regularly for years and I don't have the sense that others have done anywhere near this well. He has already matched the all time daily record twice I believe.
The daily record is $34,000 set by Jerome Vered in 1992. Jennings would have to score more than $68,000 to set the daily record.