Started with what could have been an interesting premise for discussion, and then lost me when he declared mice to be intrinsically bad in a writeup about user interfaces.

It always confounds me when people assert that the number-one desirable feature in all user experience is velocity of input. As if there's nothing to be thought about, much less discovered. Just data to be entered. That may be true in certain narrow segments of interfaces, like POS software and development environments, but to pretend that all human/computer interaction fits that mold is to be willfully ignorant of the reality of personal computing.

Edit: It's been pointed out that towards the end he does acknowledge some valid use-cases for mice, but he still drastically oversimplifies the space of GUI use-cases and ignores some of the key benefits of mouse-based interaction.