The modularity argument is not for the average consumer. Think about it, it always adds bulk, is an extra cost, etc. The Archos tablets had "modular" software, and tons of hardware options, and everyone HATED them (the prices that is). With modularity, devs don't know what hardware the user is running. Also, not everything can be modular. Can the CPU, memory, etc be modular on a mobile device? Not yet at least.

For example, I have a Palm T3, and it has an SIDO slot. Sure, you could buy a camera attachment, a WiFi card, even a GPS module. I even worked on a DVB-T SIDO module for an internship. But, the device itself cost 300, the camera cost 50, the WiFi cost another 50, the GPS cost more. And you could only use one at a time. And thats not even the biggest problem.

Ok, so you have a 2 year old device. Lets say it has WiFi, Bluetooth, touchscreen, GPS, and a "extender slot." (sounds familiar?) You bought it for 300. Now, would you buy an accelerometer for 30, bigger battery for 20, WiMax for 40, 3G for 30, etc... or just a brand new, faster, slimmer, longer battery life, etc.. for 300? And remember, you still can use the old device for a number of tasks.

Modulatiry is great for PCs, where size is not a real concern. But look what apple has done with the laptops, they even removed the battery. So now it has a longer battery life, and everyone is happy. No one but nerds care for the removable battery, and I have never seen someone buy a battery for a 4 year old laptop.