I think that the number of people who actually use the number pad regularly and want it are in the minority. It's not like you lose functionality, you can still enter numbers. Therefore Apple is catering to the majority of its users. The feature is still available at no cost if wanted afterall.
As for the idea behind a wireless keyboard with numbers. Although that's a great idea, it only caters to very few users. Not many people want the number pad to begin with, and even less would want one in a wireless format. As someone mentioned, wireless likely means you are using it on your lap and the smaller the keyboard, the better.
So many of you want Apple to make products tailored to your specific needs and forget about what people as a majority want.
Heck, I'd like an iPhone with a full Qwerty keypad, why can't they make that an option? NEGATIVE.