I agree with you about people feeling that they can do the same things on a PC, only cheaper. This is one reason I can't get my school to invest in Macs, despite not having to worry about anti-viral software and getting a great suite of creative software right out of the box.
However, this is where the iPad comes in. It is the future of computing whether you like it or not. MS's monopoly on the OS market isn't going to go away any time soon. Businesses are locked in, schools are locked in, there's nothing they can do to break away without a major overhaul of their systems and massive training costs to get everyone up to speed. Again, iPad to the rescue!!!
Step 1: Create a light, mobile operating system that even my Grandma can understand. Just touch it!
Step 2: Slip in the backdoor and capture the hearts of America with a consumer device akin to the original iPod and now iPhone.
Step 3: Let people get things done by creating software that's simple and task driven. Ex. I want to check my stocks. Click on stocks app, enter stocks once, look at stocks.
Step 4: Take over the world.