As an entrepreneur, this is why I favor starting B2B businesses. Sure, I would love to create the next Internet/social phenomenon like YouTube, but those markets are largely winner take all.
In B2B, you can be #2, #5, #10 or even higher and still have a successful business. Back in the 90s I worked with an email marketing company that scaled way too fast. The thinking was "get big or go home." Even as it cratered during the dot-com crash, small players were emerging all the time, and many of them are thriving today.