I think that's one thing that is actually somewhat strong about the app-store/marketplace update model - the updates are done by the different companies. If they decide to push too many new updates that break functionality, they'll find themselves without a customer base to keep doing that. Yes, I'd love a "rollback" feature in those stores, but at the same time it's up to the developers to satisfy their customers so I can support that. It's definitely targeted at consumers.

I don't see MS going this route for their major server products. They may bundle it in to Windows Update, but I can't see it going the way of the marketplace apps where you just get an update with no option to remove/rollback. That would break too many big customers and MS would find themselves in the position of losing customers rather than retaining them. I can see them doing it for the Modern/Metro apps as they aren't core to the OS functioning, though some may be useful. I can't see them doing this for server or OS level patches. Even their Surface RT patches for the OS and firmware go through Windows Update. Modern apps are updated through the store and I haven't seen too many major problems there (with the exception of one app introducing ads to their free version, which resulted in a bunch of negative feedback 🙂 ).