I'm not sure how I feel about adding the CGI movies. Sure, they're good, but they'd stick out like a sore thumb compared to the rest of the show in traditional animation.
Fantasmic finally drove us off last year. Aside from the original Disneyland version ( we saw it the first or second year, wow, that was a show) being so much more exciting - more akin to a live stage performance than anything since, the more recent WDW presentation just has lost its drama - replaced by sugary nice. Too fancy, too high tech, too contrived, too disjointed by tossing in clips from whatever movies are popular at the moment. Then add in the push for more and more audience participation, the growing 'second classing' of anyone that hasn't got a FP or didn't pay for a dinner package.
To the last anon,
Adding Tangled, Princess & Frog and Frozen is hardly whatever is popular at the moment. Princess & Frog is six years old. They also didn't add the CGI films that wouldn't fit right such as Wreck it Ralpha no Big Hero Six, at least the Princesses look right next to Mickey.
There is no audience participation in Fantasmic that I remember?
I agree Sisneyland feels better, but as you observe, the Rivers of America setting is more intimate than the amphitheatre.