There was a rumour on zerohedge today that the reason bitcoin bounced back up from $5600 was some big hedge funds deciding that this was the time to buy bitcoin. See
http://www.zerohedge.com/news/2017-11-13/mysterious-bitcoin-dip-buyer-identifiedWhile this big money moves in (perhaps stung that they missed out the $1000 - $7000 rise this year), bitcoin's price is supported.
What happens next depends on whether bitcoin's rivals can gain usage for their coins.
The truth is that there are so many investors waiting for those opportunities.
Zero hedge may have been fast enough to quickly pick it up, but there are so many people on ground waiting for that moment as well, which is more like, a first come first serve thing.
That is the level of support bitcoin is gaining and there are so many top players looking to buy at a good price since that is the best they can get it and that is what makes it more fun.