I believe it has less to do with the mouse when it pretains to the

of now. There was an interview down a while back with Woz on how he felt about OS X and iOS. His view was that there was nothing revolutionary about OS X as it still uses a mouse to input or control UI on screen. iOS is changing that with finger input as a primary and keyboard as a secondary (depending on desktop or laptop use).
The issue is that 3rd party software has to still incorporate Multi-Touch usage and patterns transition from mouse and keyboard input devices. Its will not happen overnight, it will take years to have a true Multi-Touch and gesture software and hardware system in place. The key is that in its infancy it seems like a gimmick since it still has to be polished and have majority of the deveolpers on board to adopt and adapt.
The MagicTrackpad and TrackPad is a sign that

has lost its interest in the Mouse and the Magic Mouse was a transition piece for people who still wanted a mouse due to software reasons and preference while incorporating Multi-Touch gestures in the mix, think of it as beta testing Multi-Touch on Mac OS X.
OS Lion is expanding on this even more. My educated guess is that the new iMac with OS Lion will either give the end users the option of a KB and either Magic TrackPad or Magic Mouse or it will either come standard with the KB and MTP.
Mice are not

money generators, its the iDevice line and its notebooks. I am still surprised that

still has the ACD considering better options are available on the market. Its the one stop shop ideology for

hardware and its has or will be adopted to the iTMS in the near future. Its a waiting game.