To answer the original question:
Yes. In theory there's no reason why we can't eventually have displays made up of pixel arrays a million or more pixels high, and, as noted, even within the limitations of current materials science displays can be made with larger pixel matrices. Of course...
????? In the slient film days both cameramen and projectionists experimented with a great many frame rates, and often varied the frame rate while shooting or showing a movie. 24 fps only became the standard with the introduction of sound, and then only because that turned out - for various...
You can't workout while you watch? That would be news to Jane Fonda, who figured out that wasn't true back in the VHS days - and made several million bucks as a result. :) In addition to using actual workout videos and interactive computer games that let them "race" from their stationary bikes...