I believe you cannot chase after time cycles and human behavior when your dealing with manipulated markets. I think we will continue to go down until no more weak hands are shaken. Then the manipulators will rise the market again and dump on the next unsuspecting investor group.
In my opinion the future of bitcoin is bright but cannot say now much time it will take. Many people do not trust in bitcoin and cryptocurrency and they do not want to invest in it. This is the main thing due to which I can say that it will take long time to take over the market. As of today investment in bitcoin is just a waste of time and thats why many people are now putting their money in other Altcoin.