The data seems to suggest that we are still recovering from the mania of late 2017 and, from what I can tell this won't fully subside until at least the end of 2018. However, there are a whole wave of institutional class custodial solutions that are hitting the markets now. Some of this stuff will be coming end at the tail end of the year. But I don't think they'll really be truly ready for the big time until sometime next year.
A lot of that money will probably help stem the current downward trend and steady it off. Perhaps we will start to see some long-term growth again in early 2019. Institutional investors are a conservative bunch. Their involvement will be gradual. And announcements will most likely bring small jumps, but as there are more and more announcements, even an Amazon coin won't be seen as big of a news (unless Amazon made this announcement now, which I seriously doubt will happen soon).