It doesn't surprise me that Apple would phase out the use of mice.
As far as trackpads go, I don't really mind them for general stuff, However when it comes to more in-depth applications, (i.e. games, pro-audio, photography and videography) I think people will continue to use mice, trackballs, joysticks or whatever they find most comfortable for that application.
Apple to me has always focused the majority of their products towards the "general public" well, Usually the "stay-at-home mom" or casual internet browser doesn't play games to the extent that she needs a high end gaming mouse, and etc. Most people should do, and eventually will do just fine with just a trackpad and no mouse.