Yeah, I've started seeing occasional queries on HN about what the Next Big Thing will be. Which raises another challenge: chasing the tech curve. It's one thing to have found the right tech, another to correctly anticipate the market's next move.

The worse when you realise everything that's up-and-coming is recapitulating all the mistakes you recognised from the last time.

The demand for Rails engineers is tied to the startup bubble. As soon as the latter pops (well, it already is), so will the former.