The people who do not need a smartphone, a tablet, or a HUD shouldn't purchase one. If they feel pressure from society to buy one or just want to see what all the fuss is about, then that's their choice.

People who purchase one for the games are doing nothing but providing funding to help improve the technology for the people who actually do have uses for smart-phones.

There are TONS of practical uses for smart-phones, but there are also billions of people living on this planet who don't have a use for them.