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I remembe watching a TV program about this quite some time back. It discussed a law that this person devised, I can't remember the name of the law or the person, sorry. Anyway, it stated that we should push for computers power to double every one and a half years and if we followed this rule we would reach the most powerful PCs we could manage by 2020. This meaning that each switch and whatnot is only made of a few atoms, we physically can't make them smaller. So far we have adhered to this law (more of a prediction IMO).

Anyway, this is nice to think about, but in practice things are different. Aspects such as quantum mechanics and nano-engineering all will have an effect on this. Another driving force is that of investors. We will always look for a way to have more advanced technology solely for comercial gain.

So simple answer = 2020
Real answer = Never