Sakis said:
Come on guys, Harrison is an A-list leading man, he's not going to share screen time in portraining his most iconic character along with another actor. Let's just hope the script and plot will be intriguing.
Beyond that, we know Ford's been aggressively pushing to reprise this role for years and doesn't consider his age to be a detriment to the character. Given that everyone involved appears to view him as irreplaceable in the role, why would he be interested in being minimized?
It reads as though some fans still can't believe Disney would actually give Ford a significant role and are trying to reconcile this news with something that's more credible in their minds. Suffice it to say, the studio probably won't be looking to a cancelled tv series from decades past or The Godfather II for inspiration here.
If The Force Awakens is any indication- and I agree it's likely a huge one- we're looking at a relatively "safe" revival where Ford headlines while being heavily aided by younger co-stars. No setting out to impress film snobs and, as with most long-delayed projects such as this, probably not delivering the kind of sequel purists would truly prefer, either.
Nothing about that would prevent Disney from being able to smoothly recast for an origin film, just as The Force Awakens isn't going to hurt the young Han Solo film(s). If anything, it's a way to remind audiences what they loved about this franchise while paving the way for a true reinvention. Since Disney owns Indy now, they don't need to make this harder than it needs to be. If they can't decide between a true sequel or a reboot, they have more than enough time to do both.
(And technically, if they do it well enough in terms of the supporting characters- as TFA did with Rey and Finn- they could potentially use Indy 5 to springboard into both a rebooted Indiana Jones series set in the 20s/30s/40s and a revived "Raiders of the ____" brand focusing on the supporting characters in the post-Indy 5 era.)