Replace Windows Phone's Tellme with Cortana?

This may sound absurd, idiotic and plain right dumb, but it would be really, really cool if the generic voice and traits of Tellme were scrapped and replaced with a Cortana like system. Having a much more advanced voice recognition service in Windows Phone is needed, and the familiar voice and likeness of Cortana as well as the advancements in what the software actually can do. E.g. services like Siri and Google Now. Of course the chances of the big M implementing anything like this is very, very slim. But personally thinking the concept it pretty darn neat. And hey a boy can dream right?