Be careful of bias is source one...your last source looks very promising!

Some good sources here, but I would be looking to diversify my research set, since most of your sources seem to focus on defining invisibility, rather than any other aspect of feasibility. Did you search the library databases?

Taken from Proquest abstract: "The fact is that deploying new technology is only one of the steps needed to soft-land in the future. Smart machines do not automatically catalyze us to smarter lives. Switching on the future entails more effort. For example, what good is going global on the Internet if your real-time allegiances remain nationalistic and ethnocentric? You can gloat over your portable equipment, but if you continue to run in place in unportable lifestyles, marinating for decades in the same apartment, the same city, the same country, the same profession, the same social ties, how portable are you?"