Hard drive space is a complete non-issue. A 2 TB drive is about $80, and can hold about 80,000 RAW files at 25 MB each (from Canon 5DII). That's 40,000 images per year for two years. Even with a second drive for full backup it's still only $160 in hard drive space, or $80 per year. This is a trivial cost compared to other costs of photography.
I'm not sure that everyone can say that. Perhaps for you it's a non-issue. But for me, if I'm going on a 2 week vacation with my camera, you're looking at only ~650 of those RAW files on a 16gb card, max. I usually don't take my laptop, and even if I do, that means I'll need to also take an external hard-drive along with it? Many times it's just not practical.
That being said, I agree with you, that if you're doing a 1-day or afternoon photo shoot, and then come home to a laptop/desktop with TBs of storage space (which isn't all that expensive any more), then having 25mb+ RAW image files is fine. Keep in mind though, if you have to do some batch editing on thousands of those, it will take noticeably longer on larger files than smaller ones. Anyways, just my opinions on the matter. I'm sure I'll be first in line once Canon actually releases these beasts.