Death. 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. 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.