The reality is that it's simply a much more entrancing and exciting experience when these amazing creatures are just feet away from you. Not in a picture or a movie but almost within reach. And it's that environment that generates the desire to learn, which isn't something that's going to happen flipping channels.
Absolutely, though if by some fluke Indy 4 sucks ass then we might want to end things here of course, maybe that's the reason to do another one. You know, end it with a good one!
P.S. In no way do I think Crystal Skull looks bad, just sayin'