So I'd normally never consider starting a business because of this long ramp-up time, but the "gold rush" of mobile apps is still very appealing. It seems quite easy to ramp up quickly there. I know a lot of apps linger in obscurity but I think I understand social / viral marketing well enough to do some decent app launches. I don't need a big exit, just enough to support a family.
What I can't shake is the persistant question of "why isn't everyone doing this?"