Think about it... he will be 29. Let's say he was hurt again which is why they tanked.
Then let's say Archie Manning was viewed as an Andrew Luck or an Elway caliber QB prospect.
You don't think they wouldn't seriously consider moving on with a cost controlled young super star QB and moving Burrow? Indy did that with Uncle Peyton... granted he was a little older, but he was also more accompolished than Burrow.
My overall point was there won't be many teams, if any, that end up with the first pick, that won't take Manning, IF he is considered a great prospect. The Bengals are one of those that it is close, but that they would be an outlier.
Now maybe Manning will have big question marks and won't be considered the next Elway or Manning, etc... In that case then he would obviously be more gettable, but then would also be a bigger risk for a massive trade up.