The seating in the area for that shows seems really limited when compared to the areas needed for a show like Fantasmic. I'm wondering if the seating for Rivers of Light will involve some sort of "up charge" scheme that Disney is becoming so famous for, as in pay a $100+ to get into the park and then pay $XXX plus to get seats for the show.
To further bolster this thought, Disney really reduced the stand by capacity for the 2015 Candle Light Processional, devoting a enormous percentage of the available seats to the CP dining package.
With all the cuts in entertainment and price increases that seem to be the focus of the Parks leadership, it would not surprise me at all if this current pricing exploitation came to fruition for Rivers of Light.
~NM