I’ll agree that there is no silver bullet, but one pattern I’ve noticed is that it’s the “small pieces, loosely joined” that often have the greatest impact on the open web. Small pieces of technology that do something simple can often be extended or mixed with others to create a lot more innovation.
I want to emphasize the “loosely joined” part of the above from Chris' comment. We need more people loosely joining software together in ways that create more possibility for writing on the web. In his talk “Don't Make Things”, Darius Kazemi phrased it as “Don't Create, Mutate” – to not think about building from the ground up but extending and remixing what's already there.