Users could surely of third-party solutions for their mouse must move if Apple was indeed to offer only the Magic Trackpad, but it seems plausible that the company would go as far from eliminating its packages of systems based on the mouse, such as the iMac. Apple began offering the option of a Magic Mouse or Trackpad magic in their purchases of iMac, but we believe that many users would be unwilling to be forced to move to a trackpad or having to find a vendor third mouse.
Apple, however, was often before the curve when it comes to termination it seen as obsolete, more recently, with the removal of the optical reader for the Mac mini.
It should also be noted that Apple continues to offer an option for mouse wired as a standalone purchase and delivered with the Mac purchasing Office. Mouse Apple, formerly the Mighty Mouse offers a clickable scroll ball and a touch shell, but is not able to recognize the multi-touch and other gestures. No there was no mention of whether if Apple is also considering phasing out its wired mouse.
Update: in a follow-up report, cult of Mac says now that the magic mouse is not be interrupted and that it is rather to receive a new number, which suggests that the device can receive an update. Our source in the inventory of Apple followed with us, and it seems that Apple has discontinued rather old number part of the magic for a new mouse. This process may indicate an update to the magic mouse, with the more logical prediction is better integration with gestures in OS X Lion.