All this reasons have to do with raising money and valuations. I will concede that this is important but I think the problem that any other area runs into when trying to take something back from Silicon Valley isn't the money, but the community.

The Boston tech community, like the Chicago, Austin, or NYC ones, have a few technological superstars. Yet, Silicon Valley has more. A ton more. It's had decades of a headstart.

That, imho, is the biggest asset that Silicon Valley has. Part of that has to do with money (all the reasons the article mentions) but a lot of it just has to do with the fact that the Silicon Valley network and community is just so damn good.