I couldn't put the full title in the subject line due to character restrictions, but here is the full question:
If bitcoin was fully adopted into everyday life, why would it ever be used for day-to-day transactions if the general consensus was that the price would always appreciate?

After reading several posts on this forum many people seem to think that Bitcoin will always go up. If this were to be the case, why would people spend Bitcoin at all? In this theoretical time, wouldn't it just be a poor financial decision to do?

Or is it thought that in this future where there is widespread adoption the price would stop being so volatile and for the most part stabilize?