Hi, Brittney. You must be a very special person to take these two little girls into your heart and want to give them a truly magical experience. I hope that no matter what, this upcoming vacation is memorable for all of you!
While it is true that Cinderella's Royal Table is getting a brand new sprinkling of pixie dust, you can still dine with your favorite princesses. A special breakfast or brunch is being held at
Citricos Princess Dining, which is located at the Grand Floridian. You'll still be able to enjoy a meal with some of your favorite princesses in a beautiful dining location.
Another option to meet some of the beloved princesses is Restaurant Akershus at EPCOT. There you can dine at breakfast, lunch, or dinner with some of your favorite Disney princesses. Also check out dinner at 1900 Park Fare at the Grand Floridian. This buffet meal usually features Cinderella, Prince Charming, and Cinderella's stepmother and stepsisters. Characters at any dining experience are subject to change, but those are your best bets to replace the princess experience.
You could also try to get a dinner reservation at Be Our Guest in the Magic Kingdom, or perhaps try to get in during lunch. There aren't any princesses, but the restaurant is Beast's castle, and I think the restaurant is stunning.
Wishing you the very happiest vacation, the most magical moments, and the absolute best memories.