Business users typically have concerns about a new Microsoft product, and that concern was proven to be fairly meaningful when that UPnP bug was revealed. They want to wait for those things to happen and get fixed.
Quotes about upnp (2 Quotes)
There is great customer interest in UPnP, especially as more UPnP-capable devices are becoming available. Folks who don't want UPnP can certainly turn off the service, but just applying the patch is sufficient to return it to safe operation.