Dual core and 64bit will be mainstream in a couple of years, but that doesnt mean that current laptops will become just paper weights good for nothing.
The only reason to get the top of the line stuff is if u absolutely need it. Todays processors are more (cant empasize that enough) than capable of doing basic tasks which a huge chunk of the customers require.
The pple that are enthusiasts and need the best stuff available make up a small portion of all the computer consumers, most pple just use it for basic processing. And u dont need 2 cores, 2gigs of ram and a 7800 gpu to do those things. A simple p3 with 512mb of ram is more than enough for most pple out there, unless ur a gamer or use cad visual stuff.