The big question here is, who is Disney making this film for?
A. The cool new kids?
B. Us old fans and nostalgics?
C. E for Everybody?
We can already tell that it's not A. Otherwise, they would have just rebooted the franchise and not bothered to bring Ford back in the first place. And well, that would have been a terrible choice, given the positive response they got from TFA.
But given it's Disney we're talking about, something tells me they're not simply trusting the familiar faces to carry this vehicle... again, as evidenced by TFA. Yes, Star Wars films are ensemble pieces by nature, and thus not directly comparable, but the main screen time was still given to the new, young heroes.
So, how to approach the matter here? Well, they've got two ways to go. Either give the elderly Dr. Jones some younger sidekicks to connect with... or place an old Indy and a young Indy in the same piece.
Now, I don't claim to know or guess which route they choose to go here. But I know which one I prefer... for a very simple reason. If the old fans are happy seeing Ford one last time, and the new kids connect with some younger character adventuring alongside him, surely the multi-billion dollar entertainment behemoth we're talking about here is just going to pass up on this opportunity, in favor of just rebooting the series with its original hero?
Well, to be frank, they might just do both. Again, look at all those Star Wars spinoffs in the making. But if I know the clientele of this joint, and I think I know it well, most would be pretty fuming for Disney spinning off some bastard franchise and spending time and money on it, when they could, in your opinion, spend those resources better with the original hero.
And therefore, if you care about the character of Indiana Jones and he is more to you than merely Mr. Ford wearing a fedora, you better goddamn pray he won't be the only person donning it under the guise of Dr. Jones in this upcoming movie. Otherwise, well... caveat emptor.