SSolomon: Hollywood seems desperate to recreate the 80's. None of these reboots, remakes, homages, are ever any good. The main problem though? People keep going to see them.
Indiana Jones was intended to be more like James Bond in that the lead would rotate eventually. It's just that it took Lucas and Spielberg ages to get back to make that 4th movie. Even before the 4th movie was out there were indications that a 5th movie was possible.
So, lumping it in with Robocop and the rest of them seems a tad unfair as this was the plan going back a fair ways.