$2000 might be a little too much, but 1000 after release of Bitcache is pretty much possible scenario. And I totally agree: BUY NOW while bitcoin is cheap!
IMO the price below $600 is very low for Bitcoin and all the people who bought for this price will profit big time. If a man with 500k followers on twitter is saying Bitcoin will be $2000 at least it means something, right?
I also agree with this prediction but don't think it will happen soon.
Before this scenario happen, Bitcoin should become more popular, online standard for payments, more popular among merchants and customers and becomes mainstream.
I don't think it will happen overnight, i short time but in 3-5 years it's possible.
I think that BTC users, which show faith and patience now, and don't sell their BTC funds for fast profit, will earn much more later.