What is the promise of the future of this medium. Ultimately this medium is just a carnival sideshow. Only one of the films has any poetic value. They are working on a 40 minute fiction film,but I don't think I could let something beam at me for that long. The process is fun to experience but after 10 minutess I start looking for the edges.
Flat film is more comfortable to sit through.
As for its economic viability, it is certain that we will not see IMAX 3-D theaters being built from coast to coast. It is doomed to be an oddity on the landscape of Megalopolis. Experience a footnote on the way to VR and go see for yourself.