Don't know about the validity of the rumor(s), but I'd say B&Beast is still vastly more popular than Tangled or even Frozen* - there's a reason it was the theme for a new mountain/castle in the new Fantasy Land. And with the comparatively low offerings of Hollywood Studios, it makes sense to continue piggy backing on B&B.
*And as another poster mentioned, they likely couldn't/wouldn't do Frozen on stage in a park while simultaneously doing it on Broadway.