It could recreate missing episodes using the extant episodes. That's something worthwhile doing until someone finds them. It's not creating a complete new series.
Even if it's motion comic level animation, it'd still be nice to see combined with the audio recordings.
People want to find the missing episodes because of their historical value as actual human artistic creations, and not because they want to watch a thing that looks like an old missing episode.
There would be as much value in an "AI-recreated" missing episode as there would be in taking the audio of a modern episode and using AI to create a new video track for it.