I think the current models are at a capability level that could create a decent 3D game. The challenges are creating graphic assets and debugging/Qa. The debugging problem is you need to figure out a good harness to let the model understand when something is working, or how it is failing.
What it should have been willing to do is go off and look for free external assets on the Web that it could download and integrate.
Also graphics acceleration makes it hard to do from scratch rather than using using the 3D APIs but I guess you could in principle go bare iron on hardware that has published specs such as AMD, or just do software only rendering.