The factors he lists are all "ecosystem" factors: a supportive environment; a dense network of entrepreneurs and investors; a productive set of social norms. (Notably absent are tax credits or other governmental factors.)
The flip side of the coin is that if you don't live in an ecosystem like that, you have to work harder at making those connections, and building the right environment around yourself. That's why (despite my reservations) I'm supportive of things like Project Skyway that introduce entrepreneurs to resources in the local community, and "density increasers" like Minne*.
On somewhat of a tangent, I have also been thinking on and off about the "craft" of software. Writers (and readers) get together at conventions to talk about what makes a good book, and how books are written. Software programmers get together (mostly) to talk about technologies. Is it possible to put together a "craft"-oriented conference in a technical field, without devolving into "methodology"? Has anybody done so? (Still making my way, slowly, through "Coders at Work", which is the sort of thing I'm trying to get at.)