The sentence is so vague it's hard to tell what he is saying. But his point would be the same even if the Wii U could multitask.
When you are dl a game on the 360 and you use Netflix or play another game online it will either slow down your dl or pause it so it doesn't interfere with what you are doing. Even sometimes while playing a single player game it will get notifications on the 360 that my dl has paused. But if I'm not doing anything on my 360 the dl is much faster. I can imagine that a much larger dl will take a lot longer especially if the system is multitasking.
THe more interesting part I took from the interview was this:
Iwata: First of all, regarding your remark that the digitally downloaded software has less value than the traditional and physical, packaged software, I hold doubts about whether it is exactly correct. When I think about it as one of the consumers, for example, I find the value in being able to store a number of software titles in a hardware system and being able to bring them with me wherever I go and, therefore, I may choose this option. Different people value different things.
^Does this mean that the Wii U will have a large HDD? I mean an SD card will not be able to store "a number of software titles" at least at 10 gigs a pop.
