1. The work on scaling issues
2. Large scale and more legitimate ICOs
3. Regulation
4. A lot of execution and usability
5. Institutional investors
I don't find 3. Regulation and 5. Institutional investors for good at all.
Also, market will grow a lot slower now. I think the best year so far was 2017 and the next better year will be '19-20, but not '18.