Earlier quoted context omitted.
I highly doubt this. Not even tablets will run on top of browsers. Developers will never give up a real operating system. You just can't develop on consumer devices like the iPad; these are designed for consumers, they come with many limitations to make the consumer's experience easy and smooth, but at the cost of hackability.
"Developers will never give up a real operating system." I always hesitate to use the word never. Things can change very rapidly. What developers need now may not be anything like what we need in 5 years. But more importantly, what a "real operating system" is will probably change in the next 5 years.
Look at photographers. Despite all the consumer level digital cameras that have flooded the market, professional photographers (and even hobbyists) still buy the more expensive (and more complicated) cameras that a consumer would probably never buy.