It's completely possible. It won't be happening.
why is that?
Because they don't want to.
We've seen it work on the iPhone 4, both before Apple bought the company and after via jailbreak. The iPhone 4 will never get Siri.
I love that in all the hullabaloo about Maps and how much it "sucks", no one gives a crap that YouTube is also gone.
Same reason Google Maps are no longer preloaded. I agree; Apple's YouTube implementation was darn good, but there's a Google-made app out now (iPhone only).
You can also go to YouTube.com. Going forward, all I can see in that future is ads, which makes me less likely to ever use YouTube again at all once I get an iOS 6+ device.
Until then, I'll enjoy my ad-free iOS 5 YouTube app, I guess. And ad-free YouTube on the desktop.
iOS is defintely a good addition to the Apple devices which brings lot new along, a good one to try. http://bit.ly/Sy6VZD