Ectually...even 4:3 material is inside a 1.78 16:9 frame nowadays, so everything is optimized for a widescreen tv.
The technology is always there, but what matter is when manufactures will jump on board and push the new materials, and if people will buy.
But scope for everything? Jeez, what's next daily soap operas in 2.35:1 Soapyvision?
The move to 4K and 8K TVs will just about spell doom for theatrical exhibition however. Few screens today boast 4K projection, and just the upgrade costs will be extensive.