Recastings hardly ever work, but as long as it's new story, continuing from and adding to the story already told, I'm not against it. Recasting everybody from a show with young actors and starting the story from scratch, or re-telling the original story, that I object to.
J Michael Straczinski (sp?) is apparently planning to reboot Babylon Five as a film, which seems crazy. But at least the same guy is making it...
The weirdness is the star in TP, more than any actor, come to think of it. I'm not sure TP hinged on any particular actor. Getting Kyle MacLaughlin in there would be great as an "anchor" if nothing else, though. It's tough and uncomfortable breaking in a lot of new actors, into your imagination... It's "work" that as a viewer, I really don't want to have to do.