But the market has shifted dramatically since 2004. Outside of software devs and people who need laptops for work/school, the number of people who own a personal laptop has significantly decreased since. (can google stats if needed) Plus there's a whole demographic of people who have never owned a laptop and don't see the need.
I'm a techie and I haven't owned a personal laptop since 2007. I travel with my iPhone and iPad Air 2, and they're more than good enough for my needs. I have Linux desktops at home/work.
Even if Apple made a really innovative laptop computer today, its target market is a lot smaller than it was in 2004.