Indeed. I've often thought that such high-latency mix-nets (with their potentially superior resistance to traffic analysis) would be a nice complement to low-latency networks like Tor.
Sadly, modern web design makes stuff like WWWoffle less useful than it used to be. Plus it's difficult to set up fully anonymous services on the far side of the link, I mean you're using Tor for a reason, and leaving breadcrumbs on the far side of the network is risky.