Say that I buy a computer today, for example an Athlon 64 5200+ x2, I can upgrade it in a couple of years with a somewhat faster CPU that consumes less power. Similarly I can replace the graphics card inside the computer within 12-18 months with a twice as fast card that consumes less that what I currently have in terms of energy. The only worthy component that I can not replace is the chipset, and I really think that replacing it should be an option.
Anyway, what I would like to see is a similar upgrade path for cars, the ability, every 5-7 years, to replace the engine with a 15-30% more efficient engine. And I think this retrofitting should cost something like 1000-2000$ max. Such an upgrade path would be welcomed by a lot of people because they would not need to dump their "old" car every so many years or sell for peanuts.
Such an approach would also be helpful for the environment as the number of new cars produced would decrease. In this scenario the only people who would be slightly unhappy would be the automakers. But I do not think their profit margins would decrease much because they probably depend more on the spare parts business, and an older car is likely to need more spare parts than a new one.
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