John Resig and Craig Silverstein didn't join Khan Academy to generate "mostly mediocre", "moderately useful" content until something better comes along.

I think it's important, especially with startups, to look to the future rather than to sit around judging the present.

In the beginning, Microsoft were making a limited Altair BASIC that only appealed to a handful of hardcore geeks, but later they had a computer in every office and home. You don't get there if you try to solve the world in step 1.