I too find this RUMOR extremely hard to believe. If the RiverBelle Terrace is going to expand UP, why do they need to get rid of the Bengal BBQ? It's location isn't near the RBT seating area and the proposed exapnsion is to add a second story veranda above the seating area, not the restaurant itself. And if they were to decide to expand RBT's width, it seems they'd expand toward the river rathar than into the bottleneck of Advntureland.
This doesn't make any sense at all.