I had the same thought about the monorail. I know with BLT opening at the Contemporary it seemed like there was an influx of people (others have said BLT has a similar number of units to what the North Wing had, but those 2 bedroom villas do sleep 9 afterall...) so I don't know if a solution would be more watercraft service, a dedicated watercraft for the GF and another for the Polynesian, or if the rumored walking path to the MK would be enough to offset (it seems like it'd be a long walk! except, at park close, it'd still be the quickest option I bet).
As to the picture, I agree it looks large. In person, though, I didn't think it looked quite that dominating. We really need to see it once the full roofline is in place. Fingers cross it compliments the other buildings.