This is more likely to happen. But we don't really know because everyone thought bitcoin will get back on its track but it just went down again and people is starting to think bitcoin will fall for good. If you want to risk it then do it because bitcoin's rate is good in all about risks. But don't expect this year. It might go out next year for bitcoin because the rate right now is just so bad.
Bitcoin price has no limit, it could spike to highest price when demand will increase sophisticatedly and being a decentralized currency it will soar up higher. Doubling its value will always depends on how the people demanded fo it, and this year all I am hoping for was bitcoin will be leaving the bearish market. When it happens that bull run will come, I think the value will be double or tripled by the end of this year.