Bitcoin became a household name in 2017 and with that came a huge increase in value many made money and got out only time will tell if we see the same again but the biggest problem is no big name companies like amazon and eBay using it.
I don't think 2018 is the most crucial year for Bitcoin because Bitcoin market price is very good enough if we compare it since its started. I know market price will bounce back because of wide spread adoption of Bitcoin.