UPDATE: As I e-mailed to Stephen Rider:

Somehow I don't know if I'm thrilled by the idea of a 60-something Indy. And aside from that, the trilogy had a certain nutty cohesion, since each of the three movies had a completely different look and feel, from the crunchy noir of the first, to the pulp swashbucklery of the second, to the cornball slapstick of the third. As a kid I remember appreciating the latter the most, but these days it's hard for me not to focus on the first as the purest expression of the concept. And yet somehow the three of them make for a convincing unit, one that ends appropriately enough with a riding-off-into-the-sunset scene, almost a curtain call. To reopen the series—to pry open the Ark, as it were—feels almost more wrong than doing horrible prequels of the Star Wars movies.

But hey, these guys are geniuses. Believe in them and their ability to come up with new and unique ways to ruin a good thing.