Sure, I would say that it is possible. With what it has done before and how fast it can move, I dont think it's completely insane to guess it could be 150,000 or more by December. Bitcoin is notoriously known for its volatility with large price swings. It is what it is.
You are right Bitcoin has a history of surprising everyone with massive moves. Given its past performance one hundred fifty thousand dollars by December is not far-fetched.
Its volatility is part of what gives it such explosive potential.
In cryptocurrency bold predictions often come true anything can happen.