Well, I DID see old Indy. In the tv series and in KOTCS... it all depends on what role they give him.
But it's not like Han Solo. I loved Ford in TFA, I really did. But they made him a) and old man/mentor like and b) he as always a secondary character. So they did well here...
And then there's the other thing: the time where the next Indy should take place in. The 60's? The 70's. I thought KOTCS was already pushing it.
Indy was made to star in a time before WWII. Spielberg and Lucas said that many times before the made KOTCS. Because they felt the world kinda lost its innocence after WWII... Although philosophically that's kinda nonsensical, I kinda got what they meant. His character was from a different era. The closer you get to the now, the more impossible his character gets.
Anyway, obviously it's gonna happen. I'll see it. Let's just hope it's better than KOTCS.