I don’t see much of a change in workflow even if they made the engine. I don’t think it would be built into any of their current softwares and if they weren’t, any modeling capabilities would probably be very limited.
To be honest I would stay far away from a game engine made by Autodesk. Don’t get me wrong, I prefer 3ds out of all the alternatives, but it’s pretty wonky at best.
There are bugs that have been around for years, some major features feels like they were made 10 years ago and then never touched again.