The cycle always seems to follow:
1. Cash enters the system through low interest rates by the fed and other economic factor (boom times).
2. Tons of new companies emerge, all hyped, all with shiny new products and tons of marketing.
3. Things are good for a while but eventually hard times hit. All the companies propped up by hype and that don't truly have a good business in place will fall the wayside.
4. The few companies that weather the storm tend to last longer and become established players in the space.