This article by VentureBeat paints a good picture.
Vertically focused startups are pulling some of the best performances around. Why? Because they're not so broad as to try too much and be great at nothing. Instead, they're focused enough to treat their target user base like VIPs. This is why I think my startup, Teaity, will ultimately do well.
Not everyone can be, or should try to be a "unicorn" startup.