How is Minecraft *any* good as an interface for designing something you'd want to make a 3D print of? Everything that can be designed in Minecraft can be build with Legos.
I don't see a lot of future games going down the Minecraft lane. The actual gameplay is rubbish (build a house before the first sunset, and you'll forever be safe from harm), and the game has nothing to offer except extreme customizability. It has an awesome niche appeal, because creative minds have a lot of opportunity to go nuts. But as for inspiring future games? Either you:
Keep the concept and refine the execution - improved graphics, more types of things to create and more methods of customizing behaviour (Second Life anyone?) - or:
Try to implement Minecraft'ish features into a game with a decent challenging gameplay, and you'll lose the creative minds who now have to worry about not dying AND the powergamers who realize that any game is easy when you can summon a brick wall.
One of them is an attempt at beating Minecraft at their own game, which can either succeed or fail - the other is doomed to fail as you attempt to combine ultimate sandbox with actual gameplay, thereby forsaking the benefits of both.