There have been plenty of rumors over the years of Beauty and the Beast getting replaced by other shows (e.g., Tangled), but I haven't seen anything legitimate recently. Wouldn't shock me if they decided to go ahead and do so as part of the forthcoming massive overhaul to the park overall, but there hasn't been any scuttlebutt lately. No doubt just a calendar timing thing as noted above.
That show is one of the best things going, and I'd personally evict Ariel (her show, anyway) from DHS long before Belle. Even so, it wouldn't bother me to see either one get replaced with some similar but different show, especially now that both Ariel and Bell have their own attractions going over at MK. The Tangled gang does have a mighty fine bathroom over at MK, but that story is ripe for a show of its own.