. It's what Harrison Ford is recommending for cinematic legend Indiana Jones in the next installment of the franchise. Which means that YES they are working on another for sure BUT that Harrison thinks it's time to pass the whip to Mutt.
Harrison thinks it would be good for Indy to die and pass on his hat to his son in the next one. George especially is resisting the notion but Steven is considering it. Funnily enough Harrison wanted the same for Han Solo in the final Star Wars but George put an end to it. This time he doesn’t have all the say though.
I think we all know Indy's time for adventure is at its end but there is no reason to kill Indy on screen, imo. I'd be all for them filming the movie and passing it to Mutt(assuming he's a more likeable character) but it still leaves open a window for other media(comics,novels) to play with the idea of Indy still doing something.