On the RHS, post hype, the second movers could work on the boring, unsexy problems in those domains nobody wanted to solve. And solve them extremely well. Then build a moat around that.

There is also a customer adoption curve of technology that lags far behind the technologist adoption curve. For example video on the Web failed a long time, until it didn't, when Youtube began to succeed. The problem became "boring" to technologists in some ways, but consumers gradually caught up.