He very clearly laid out the free market vs. centralized control argument, and why the free market path is always the better option.
This is a great way to position BU IMHO, as the free market alternative. BU will not cause large blocks, instead it will allow miners and users to determine the appropriate balance between fees and size through open market mechanisms, which are always better than a small group of controllers.
The small block sizers are arguing for centralized decision making over letting the market make decisions. This is the basic truth of the situation that is against bitcoin's principles, and the argument to keep banging them with. All of the technical arguments are just methods to side track and confuse the issue.
Edit: If this run keeps going we are going to run out of transaction space sooner than people realize, it would be great to have BU as a standing and ready alternative for when that day happens.