Willow actually had a series of sequel novels, which were written by Lucas and Chris Claremont, who apparently made the Xmen relevant. They saw Willow's whole family and Alora's foster family all get nuked, so he became a grim badass who calls himself Thorn Drumheller.

I have, in fact, pointed out elsewhere on this site how silly it is when you take a step back. The whole scene that ends up with Marian's supposed death and Indy gunning down the swordsman should have been scored to Yakety Sax.