It doesn't matter who's involved in this movie, if Ford is in it, it will suck.
Indiana Jones is a strong adventurer who gets to discover old treasures, kill bad people and bang hot girls. That's all there is to the character, it's meant to be a perfect self insert for guys. Everyone wants to be Indiana Jones, no one wants to be old Indiana Jones.
They will either make Ford "a tough old guy" again (which really doesn't work when the actor is 74...), or prop up a new Indy to take over in next movies, just like they tried (and failed) with Shia la Buff or whatever his name is.
If they want new Indy movies, they should just make a remake and be done with it.