Where booms really come from is when someone invents a taller ladder. Then a whole bunch of fruit suddenly becomes "low hanging" that wasn't before. (Yes, that became a horribly butchered metaphor. I still think it makes a valid point about how booms occur. They come from newer and better tools that make things easy that used to be hard.)

There's still lots of deployment of existing technology to be done. But most of the "get rich quick using off the shelf technology" has been done for this round. There are just too many people trying to do that.