I would agree with you if you changed Q4 in 2017 to Q2 in 2018.
Personally i don't see any sort of bear market or major correction coming until around April or May next year. There are still a lot of people taking on long positions on bitcoin and certainly a lot more institutional investors than before.
But we are in a bubble, and it will pop eventually in the form of a bear market. As i said, it'll probably happen Q1 or Q2 next year.