it's all a question of what you use it for.

If you use it for a high value application then a high price isn't a barrier. The fundamentals that are shifting here are: (a) Apple is going to push a massive increase in quality (b) Apple is accessing a different market - cashed up professionals

So the real question here is, does the increase in quality get it into a space where new high value applications become viable.

For me, it would only have to be equal or better than using a physical monitor and that would probably justify its value. The fact I could just go anywhere and a full multi-monitor setup with me would be enough.