Well, the DS managed to last about 7 years. I don't see why Vita and 3DS can't manage it.
Aside from the fact mobile technology is increasing far more rapidly than computers, and in 7-8 years time we'll likely be seeing console-grade graphics and games on phones, so that could be an issue.
It will be interesting to see how things fold out for this portable generation, for it may well be the last 'true' portable generation.







