I don't think it will reach $100k in 2018 but I wouldn't bet against it.
If you told me BTC would hit $10k or $20k in 2017, I would call you crazy.
So with all this crazy adoption who knows what will happen.
Obviously no one would ever want to bet against anything when it comes to the matter of cryptocurrency. Anything is possible, but from the look of things presently, it is looking a little bit bleak, but like I said, it is still too early to judge. I remember last year when a lot of people were betting that bitcoin will never reach $5000, now the same set of people are betting that bitcoin will drop so low to $5000. At the end of it all, no one can know the future.