Think of it this way. For any given transaction, the spender will want to spend USD, the receiver will want BTC. Lets say the receiver gets his way. Then the s

Think of it this way. For any given transaction, the spender will want to spend USD, the receiver will want BTC. Lets say the receiver gets his way. Then the spender will want to hold onto the BTC anyway, unless the product/service is something they really need. The receiver will have an incentive to give in because if they demand BTC, then for most people they get nothing, but if they demand USD, they'll get USD and could in theory convert it to BTC while holding it.