Screenplay is a tool, a blueprint that serves various departments throughout pre-production, production and post-production. That blueprint is also in flux as others are using it. I guess, well I believe one could modernise the whole screenplay pipeline. Trouble is you would have to make a significant advance in order for people to start using it. Every dept. except acting/blocking could start using new system(s) right away. Acting and blocking would still prefer paper.
Take into consideration that it's easy to criticise a system as an outsider. You would have to witness first-hand an organised chaos that film and/or TV production is in order to appreciate every single idiosyncrasy (at a first glance) that makes it all work.
Prime example are cameras. Usually people (who are for the first time on a set) ask about camera. Why this camera, why not that, etc. It works and doesn't stop the production train. If you can avoid slowing down anything on set (or before or after) and THEN introduce significant benefits, people will listen and welcome you immediately. This is an industry that takes in new technologies all the time, no hesitation. Provided they bring significant boost to productivity.