A push notification is a push notification. Apple doesn't have to change anything in the notfication system to support RSS feeds - it already supports the functionality you want. Your problem seems to be that you want Apple to make an RSS Feed Manager (iFeed). They had two, and neither worked very well.
The Notification Center would be a terrible RSS reader if you have more than a few feeds, and checking subscribed feeds is the exact opposite of getting things pushed. Someone could write a service that takes RSS feeds and pushes them to your Mac. They are probably more likely to know who get the RSS feeds.