Are you thinking like a James Bond-type treatment? That would have been interesting injecting a new actor for Indy in subsequent films. The new actors would always be judged by the Ford die-hards, but that was a fun part of James Bond as well. Everyone has a favorite.
I enjoyed 1 and 3 the best. I get what they were trying to do in 2, but it just didn't land for me with dark tone, over the top gore, and then a slapstick moments all just felt disjointed. 3, despite some of its cringe moments was still a fun ride and felt like Indiana Jones much more than 2 did.