You are assuming you want to carry your cellphone all the time, even when you are at home. Maybe slip the phone under the pillow when you are sleeping. That is not how I envision the future. When you are on the go, yes, you will need something small and light to carry that can do some critical communication. When you are at home, just leave the phone on the table. It will automatically sync up anything that needs sync up. When you go to your desk, you turn on the screen, you have a powerful computer with all the updated information. When you lay on the bed, pull your tablet and it has all the lasted information as well. Why you even want to carry the phone and put it in the dock?

The growth curve won't be steady. It is going to grow fairly slow for some time, until there is a break through and the curve will jump to another level. When the curve will jump and by how much is unknown. It all depends on innovation. Taking an average rate on this kind of curve is only useful when you look back and try to measure the impact of the past innovation. It is not useful for predicting the future.

i got an eee pc HA900 from newegg for around $290 after shipping and california tax. i use it as a 24x7 server. i have been turning it on for 3 months. so far, i have not run into any problems. it's energy efficient, very quiet, stable, poweful enough. i got windows XP home pre-installed, and a vm running linux as lamp server. i guess you can install linux directly on to the box. i choose windows as base because it comes pre-installed and easier for me to connect to other devices such as printer, wifi router, usb stick, etc. it even has build-in "UPS" (the battery), "Console Terminal" (the keyboard and LCD), and "Surveillance Camara" (webcam). everything works out beautifully so far, and i have no complaints.