[cromwellian]

In this particular case, I'm not particularly arguing against it, just in general, the way I see things going.

There are lots of other promising ways that people compose Web services beyond this issue with fonts, services like Stripe or Geo, technologies like the upcoming Web Components, embedding media like Tweets, where I don't particularly think we will be served well by a paranoid model.

Your model of blue-links-only almost entirely prevents the kinds of service composition that almost all sites engage in these days.

It's also not clear it's a net win for speed or security. CDN sites are likely significantly more hardened than most regular sites, and most regular sites don't necessarily scale, or don't want to pay to scale, to reach top performance. That means people cut corners.