From my personal experience with bitcoins, I believe once btc rises to 500/1000, many share owners will become greedy and look for the NEXT big target. 2k? 5k? 10k?
There are already potential millionaires from early AM investors, yet i'm sure many are still holding onto their current shares... Heck I'm sure Friedcat and his team could retire now and most likely never need to work again in their lives if they cashed out now.
THis! If it makes it to $1000 I think there would be no stopping it at that point.