If an asset is expected to rise, people will hoard it given the choice. It's only human to aim for realizing the gains of your most productive assets.
If you convert all of your currency into bitcoin, hunger will force you to spend them, no?
Spending on needs(food, clothing, shelter) isn't really a "choice" in the economical sense. Choice is more like buying a new TV or having a $40 meal. Those are not needed for survival.