I don't think they should change the date of Halloween. Like the majority of people here, I do feel that having it on a Saturday makes it special when it lands on that day of the week.
That said, I would be ok with expanding the celebrations over the span of a week. That would be fun. Then ending with the traditional door to door trick or treating as the main event. So like, start one week prior to Halloween, maybe have things like haunted houses, ghost tours, business trick or treating, maybe school events that are involved, charity events (someone once mentioned filling a coffin with canned goods...I like that idea!), church fall celebration events, maybe movie theaters could offer screenings of the older classic monster movies, or some new horror movies to come out, all that could be during the week and then build up to the final big celebration of trick or treat, and not take away from the traditional holiday or the traditions behind it. Instead, you make the holiday bigger that way. The problem is, it would require the cooperation of an entire town or city to do that. Where I live it would be difficult, but I think it could happen. We got more Trick or Treaters this year than the last. Who knows, maybe we'll get even more in 2015!