You can drop the "Without that commitment". It's very simple: Any solution that *requires* host changes is infeasible. End of story.(For one, earler versions of Windows don't use/support Windows Update, and a lot of people have it turned off anyway, from paranoia/prudence/ whatever. But just in general, there's a lot of old stuff out there, not just Windows.)
Even if everyone had Windows Update enabled, it would take too long to get every system upgraded.
The most popular network-based application is your favorite browser. How many of them are not on the latest rev?
Upgrading roughly 2 to 4 CE routers at every site on the Internet will happen in far less time than changing every host.
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