if Bitcoin ever reaches 10K, it's gonna be by the end of 2014 I think, not a long time after that.
I think it has to take longer, 10x more value might mean 10x more time to go to this value. It would make sence to me
Only if it's linear. Now, look at this graph and tell me if it looks linear to you

Maybe I'm being too optimistic, maybe getting from 1000$ to 10.000$ is much harder than from 1$ to 1000$ but I don't think so. What would make sense to me would be that the more people know Bitcoin the more people convey this news to other people and so on...
you're right, it'll most likely continue the current trend of ~80x increase per year, resulting in 1btc being worth over the entire world economy by 2017 or w/e