Try spending Singapore Dollars in the USA! 
You’re missing the point.

You don't need to have a highly valued currency or a large money supply for something like Bitcoin to be easy to use, but in most countries you would be hard-pressed to find a house that anyone is selling for Bitcoin, although you could probably always find someone willing to sell it for Bitcoin depending on how desperate they are to get it out of their hands.

Sandwiches are easy, most countries have at least a few stores accepting Bitcoin and they often have a lot more for sale than just sandwiches. But I've seen a few in my city, even without exploring, just on a street corner or whatever. The prices aren't bad most of the time...