The reason we don't see phones that last that long is that it's hard to make a profit. Companies would need to charge a lot more per phone before they even think about it.
I like the idea but to make a profit companies would have to sell it on a subscription basis or charge a lot more with financing being part of the sale.
If you don't have any argument to support an opinion, you can always support it with "it's <year>". Or if you live in a very rich country, "in <country>".
