With "disruptive innovations", what the market often cares about is 'good enough', and if the improvement curve of Ubuntu puts it on track to supersede that, that's all that's needed. I don't think Ubuntu will ever be "better" than MacOS (well, except for the fact that Ubuntu does focus follows mouse like God intended [it's in the old testament, I think], but I guess I'm in the minority there). But for that matter, neither is Windows, and it seems to have a slight numerical advantage. I think we're seeing the leading edge of Ubuntu with the netbooks.

Here's a graph:

http://en.wikipedia.org/wiki/Disruptive_innovation#The_theor...