The US economy actually depends on innovation similar to how the Middle East economies depend on oil. We are innovation addicts.
It's a myth that innovation itself is needed to stimulate consumption. There are plenty of existing things people already want, if they simply had the money.
But, anything that becomes a commodity to manufacture or manage gets shipped to cheap 3rd-world manufacturers (C3WM) where labor is cheaper. To maintain the USA's higher cost of living, we have to push the envelope to create new devices and markets that are too cutting edge to be commoditized (yet).
For example, when personal computers were new, they were mostly made in the USA. As they became more of a commodity, their production shifted overseas. Jobs himself used to assemble Apple computers in his garage.
Apple similarly knows they have to push the envelope to avoid being bowled over by C3WM who can throw labor at the problem. The expense and complexity of wireless earphones may seem like overkill now, but if they make Apple products slightly more convenient than the others, they have a sales and marketing edge over the C3WM that allows them to charge a premium.
Eventually the C3WM will catch up in wireless earphones and every phone will support them, and Apple will have to move on to the next Next Big Thing (which is probably already in their lab).
Thus, it's not just a "first world problem", but a first world survival technique (if you want to survive as a first-worlder).