Dreams! will be running daily at park closing this winter, and there will be a special Christmas version running during the Christmas season this year.
They always leave it ambiguous in the brochure to put a sense of urgency into your mind so you make your booking earlier rather than later. It's one of the oldest marketing tricks in the book.
As for next year there is a rumour that the show may drop down to Thursdays, Fridays, Saturdays and Sundays during the low season in January and February, but this rumour was circulating last year and it still ran every night.
It is an expensive show to run on a daily basis, roughly 16,000 Euros per night but the show has the highest guest approval of any attraction in the park and because of this, and I can't see them stopping the daily performance anytime soon.
This type of show is the way forward for WDI with 'Once Upon a Dream launching recently at Tokyo
Disneyland. The show uses the same projection technology as found in Paris but without the water screens as the castle in Tokyo does not have a moat.
With Walt Disney Parks and Resorts having more involvement with the day to day operations of DLP I can't imagine them allowing the park to close without the Dreams! show being presented daily.