Newsies was also never meant to be a long-running Broadway hit. It was written just to have in the Disney catalog to sell to schools, community theatres, etc., and the PaperMill production was done simply to create awareness/hype for the show, since most kids then weren't very familiar with the film. Then it became such a huge hit that they took it to Broadway for a limited run, and it ended up turning into an open run. I think since Disney never intended it to be the next Lion King, they wanted to close while it was still successful, take it across the country (with the Broadway set, as mentioned previously), and then use all that hype to sell the licensing rights.