The start of institutional investor money actually happened early last year, and is especially one reason Bitcoin along with other cryptocurrency started the rise around that time. The new money inflowing was not obvious, but I read a few articles that said a lot of these investors suddenly began selling off or liquidating SOME of their long-term assets, this was noticed all over big funds in the world. It was not so big to create panic among them, but it surely speculated exactly what this article said: long termed hodl position.
But yes, maybe this year will be more, and then it will peak in 2019.
So I assume there will be a peak in 2019 or 2020 like you, after that bubble is going to burst or maybe after 4-5 years, market cycles is not clear.