Canonical has already started work on making Snappy Package Manager (a replacement for apt based dpkg package manager) and Mir (a replacement for the X window server system) for Ubuntu. But since features promised by Snappy Package Manager are already available in Nix Package Manager, so essentially there is no need to make new one. Similarly Canonical could contribute to make X windows better but instead they are making a new one.
Which makes me wonder has Mark Shuttleworth gone overboard? What do you think?