Bitcoin can never be related to a bubble. Bitcoin was created and designed just like gold. Gold is limited in supply(does not regenerate yet we don't call it a bubble). Bitcoin will recover its price gradually and take the leap from there as the demand and understanding of its concept increases each time.
I believe bitcoin is never a bubble.Given Bitcoin’s volatile market value, it is all speculative as to whether it will survive and possibly even thrive. But even it's price fluctuations, i think is normal for the market base on certain factors like the demand and supply rules.
As for the price, bitcoin value started very low since it inception in 2009 but rose to all time high of 19000$ in 2017 and currently trading at 8500$,as not shown any sign of a bubble in my opinion.
However, bitcoin will definitely recover and may hit 19000$ towards the end of 2018 when some of these factors that made it drop stabilize.