Everyone was saying the same thing about Indiana Jones 4 & 5… and they’ve yet to move forward with a 5th film that was supposed to feature less Indy… and it doesn’t look like they will. I think the powers that be might just be realizing that people don’t want to see classic characters replaced.
For me personally… I will generally happy to see a GB3 as long as all four Busters are there, and Sigourney Weaver preferably.