Technically, I suspect they could easily make em last 10 years without too many drawbacks. And if you're willing to be a bit more compromising, much more even than that. But why engineer that kind of life expectancy into a device that's going to be hopelessly outdated before then?

But a little more honesty in expected degradation would be nice, including the warranty that if degradation exceeds some minimal specification, the phone will be fixed at the manufacturer's cost, and not just for a year. 10 years may be unnecessarily long, but 1 year is definitely too short; and the level of acceptable degradation is too vague.