Very astute and quite plausible, except that this scenario would only worsen the bottleneck by Splash Mountain, unless the traffic patterns and walkways in the area were dramatically reworked. At least, so it seems to me. But maybe I'm not visualizing it properly.
I think that putting a ride on the established expansion pad behind BTMRR is the most likely scenario, but I just feel like it would be potentially short-sighted since it would exacerbate the bottleneck in that area.