Yeah, Harrison's career isn't over yet.
If he grew a beard Disney could use him in a Santa Claus movie.
Saying that, if he's fit enough to scramble down a chimney he might just be fit enough to dive under a descending door, outrun a giant boulder, get dragged behind a truck, or go for a refrigerator ride. The options are endless.
And because it's fun to see Indy get hurt it'll be even better this time because the chance of injury is greater.
Go for it Disney. Follow the money!