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.
BTC hitting $100k is very possible. Widespread adoption and more fresh entrants into the cryptocurrency market will drive the price up. This is exactly what happened last year. The adoption and awareness increased exponentially, implying fresh cash injection into the industry. Overall, $100k is very feasible!