nearly all Coins except ripple took a huge tumble within the last 24 hours, with BTC failing to reach 20,000 before the end of the year as price comes back to 10,000$ (7500£) , alot of people are shaken up due to its voltility as a huge amount of people where buying at highs of 16,000+$ , as the price come back down to retracement , looking for it to reach new highs as the new year starts .But right now there is alot of speculation that the Bitcoin Bubble is about to burst, i personally dont think that is happening yet, after big institiutions trade it (Goldman is also looking to begin trading BTC in the new year) the bubble will then become bigger as have a much higher possibility of bursting. everyone is buying a speculation of air right now, but its something much bigger than the US as the dollar becomes weak, its a global currency that no one controls and being decentralized and non taxable is the best thing you can seek for in a currency, i see alot more growth in Bitcoin, even if the bubble burst there will still be high value for it, thats just a better buying opportunity for Investors.