Treylina's right. Besides, any YouTube exposure Jazz would get from a re-release would likely be from channels like Lazy Game Reviews or Ancient DOS Games, which tend to have fairly mature(And pretty small) audiences.

And, like Treylina said, JJ2 has limited modern appeal. It's like black and white TV -- a lot of people don't even like to watch things in standard definition, and the same applies to gaming.

In summation: A re-release would benefit everyone and have literally no downsides. Epic not releasing their older games is a baffling, and honestly pretty stupid decision. And it's not just Jazz, of course -- Xargon, Epic Pinball, etc. are all names you'll hear big DOS gamers rave about. Hell, even Dare To Dream is a very interesting and creative idea, despite its less than stellar execution.