It would either have to be a fully-animated film at that point... there's no way I can see how it could be live action... or it would have to be a re-cast.
They are all way too old to really do action movies these days without it being scary and embarrassing.
Unless it's ultra-CGI-enhanced actor body double/ stand-ins, and they just provide voice talent.
I picture it as them playing current-age cameos at the beginning... handing the series over to the new generation... but who knows.
Native XWA.Netter (Nutter?)