That technology isn't going to happen. It's not 1990 anymore, where you could make an 1 fps software-rendered 3D game and wait 18 months until tech catched up. PC technology develops towards mobility now and game consoles started downsizing in 2013 already - the $599 PS3 super computer cluster of 2007 is never going to happen again.The demo is even hard to run on my game computer. I'm not sure it even runs decent on a maxed out gaming computer. This game is already at this stage demanding next generation hardware like quantum computer or optical (I saw an article that some research show good results in this field). So even if they finish the game, we have to wait for technology that can handle it and is affordable enough.
Technology-wise Star Citizen backed the wrong horse. Fidelity is a thing of the past.