#Bitcoin will be spent on productive goods. No one can rationally claim that people would rather save than survive.
Human action and valuations cause relative price movements over time.
Over time, if hoarding is detrimental to the economy, people will hoard less and spend more, or vice versa.
Yes, people will accumulate more capital (save more). Also called, getting wealthier. And spent on basics.
If saving made you poorer, you wouldn't do it, hence why people spend during inflation.