Someone must be doing this for animation, right? I want to watch all the animated classics at full frame rate. Purists may gasp but I think that it won't be long before these models can do a lot better than mere interpolation, preserving the original feel of sequences despite the increased frame rate and avoiding the "soap opera" effect.
DAIN[0] is very popular for increasing framerate of videos, including animations. Examples:
https://www.youtube.com/watch?v=IK-Q3EcTnTA
https://www.youtube.com/watch?v=unRdyQYwL5k