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You say that like it's a bad thing.

But it's also a massive increase in scope, and will likely make the end product less appealing/interesting from a nostalgia point of view.

Stat blocks aren't protected by copyright. Most game mechanics aren't patentable in the first place and Diablo patents would have expired.

Names fall under trademark law and even names that they've bothered to apply for (let alone all those rejected for various reasons) aren't difficult to change.

Story is a different question. The core story is incredible thin and derivative. Creating a new story wouldn't be very hard. That said, most players today would probably be much more interested in multiplayer anyway.

I'm thinking more along the lines of names + stats, and game rules in general, if that wasn't copyrightable I'd imagine nobody would have to license D&D to create a video game based on it.

All that is content too and it's in the game files.