As one of the old-timers who attended the very first NDK, think I'm gonna throw my .02 c in; as much as I disagree with the attendance cap, NDK as it currently is is first and foremost a non-profit convention. Unlike AX or Otakon, we don't have the option to spread the convention accross multiple hotels, nor can we move to other hotels in the area. The cap is a good idea for 2 reasons; the first is because it's not like we're turning away people by the hundreds, which means people still get to enjoy our convention. The second is that this thing is most likely not going to be permanent; until a bigger, better hotel opens up, we'll be stuck with the cap until then, but that's definitely not a bad thing.
I also wanted to add, that we still have NDK and Animeland Wasabi; I know there are camps that say one is better than the other, and that one sucks because of a multitude of various reasons. Before 1997, your biggest bet on attending an anime convention(before anime hit it big with Sailor Moon and Dragon Ball Z) was going to Texas, Maryland, or California. I think this cap will allow the other convention to grow in size, so that way there can be healthy competition between the two conventions. So, that's all I've got to say about that.