Main Street cannot get any more crowded than it already gets (wall to wall people), and at least this will give guests something to watch other than the idiots trying to make their way out of the park 5 minutes before Wishes (what is wrong with these people? If you don't want to watch the fireworks, use your brain and leave a half hour before them--but why would you not want to watch Wishes?) Just because there would be a show just before the fireworks or parade doesn't mean you have to watch that show--that's the reason for having multiple shows, and the increase in people in front of the castle will make it even easier to find a spot to watch the parade in Frontierland, for example. Furthermore, not everyone has to see every piece of entertainment every night. Remember that back in the 1950s and 60s, Disneyland had nightly entertainment in every land, and you chose what you wanted to see.