I was just reading an article from 2013 where one of the Winklevoss bros predicted 40k.  Anything is possible because far more people want it than there are coins available.  But also there is a psychological problem that people in general might prefer to buy 10 litecoin in stead of .1 bitcoin, I think maybe it just feels better but I don't know for sure.  It used to be that there were not really that many good alts out there but now there are some decent options.  Alt coins might cause an upper price limit to bitcoin.  So if the price would have gone to 500k, with all these good alts now maybe it is only going to 30k.  

On the other hand the ico market is nuts right now, and if too many people get burned by shitcoins then after the cryptos fall (and bitcoin dies again) maybe people will flock back to the relative safety of bitcoins.  Or maybe more countries try to ban ico's.  Anything can happen, it is very difficult to predict.  I still can't believe these prices!  I saw an article, doom and gloom, predicting a market crash all the way down to 6,000.  6K!  I didn't think it would get to 6k this year, so if the 'bubble' bursts all the way down there, I will be perfectly happy with that price.