Yes. That's why I've never bought a computer - next year there will be a faster and cheaper one on the market. And that's why people regularly starved before fiat currencies were introduced. They were just hoping they can buy more food tomorrow for the same money.
People don't need encouragement to spend. They need encouragement to save. Whoever thinks otherwise, should talk a bit about it with an average American.
Noone is going to stop spending because their currency will have 2% more purchasing power in a year. And the economy would run much better if we weren't wasting so many resources on shit that we don't need and never-ending boom and bust cycles.