I'm afraid this is not a valid question until Bitcoin's price is tied up with fiat.

What you can afford to buy with your Bitcoin is pretty much based on how much Bitcoin is in fiat. In the first place, is there any store all over the world selling whatever kind of goods and services which puts up a fixed price in Bitcoin, oblivious to its rise and fall as far as the US dollar is concerned?

I'm afraid there is none so I guess the question is at best premature. We cannot find any valid basis for its answer.