[viraptor]

I'm curious if this will result in any popular CDN folding. After a decent chunk of users update, they'll be hit with much more traffic than usual - and possibly more than they can afford in some cases.

[dathinab]

Very unlikely IMHO.

There is still caching, just not caching of the same resource used by different domains.

Most people most times visit a small set of domains. All for which the resource still is cached from the previous visit.

Combine it with the small likely hood to get a hit on cross domain caching the change in traffic is likely negligible.