I think we will have bottomed out by summer 2019. But the next mania phase will probably start summer 2020 and peak early 2021. Between then I think we will trade sideways. We're following a pattern very similar to what happened in 2013/2014. The laddering down from the high took quite a while to complete, but this time we have acceleration of the trend.

The technology isn't ready yet for mass adoption. The people were ready last December had bitcoin and other crypto's not run into the scaling roadblock. But when the technology is finally ready enough for the average unsophisticated nontechnical user to send transactions simply by moving your finger across the screen, that's when there will no longer be a bottoming out crash after a high. This pattern will repeat until mass adoption happens.