Many of the same things as five years ago. While it's easy to say IoT, cryptocurrency, or whatever the latest buzzwords happen to be—there's ideas that have be

Many of the same things as five years ago. While it's easy to say IoT, cryptocurrency, or whatever the latest buzzwords happen to be—there's ideas that have been floating around for years which are still viable, it's just that they're hard and require exceptional execution. In that sense, they are almost timeless until implemented correctly. For example, another comment suggested marketplace/content discovery. That's been an unsolved problem for almost a decade now. Ads are another great example: they've been dishing out human misery for about the same length of time. People hate them, so they use ad blockers, and everyone loses. These aren't new problems or opportunities.