At some point we will go through a stagnant year because there simply can't be a constant level of demand pushing the market forward.
Each market experiences a major crash once every few years, and Bitcoin is definitely not an exception. It might be an artificially initiated crash, but the main point is that these crashes are healthy for the market.
It allows coins to change from owner and to attract attention from people that were waiting to enter the market, but didn't do so because of the price. That's how you attract fresh capital.