With the introduction of Ubuntu Software Centre, I remember reading, though I can't find any reliable source right now, that the various package managers were going to eventually be deprecated. Indeed, Gdebi is no longer a part of the default installation, and I heard that Synaptic was scheduled to the removed in the near future.
But what about the command line tools? These are far more efficient than the Ubuntu Software Center if you know what package name you're after. Will they continue to exist as standalone apps, or will they be rolled into Ubuntu Software Center in some way, becoming it's command line interface?