I mostly agree with you. If some meaningful non-bitcoin Bitcoin-based trustless asset existed (DAO shares, oracle-based bets, etc.), then an atomic swap would probably do.
For most typical exchanges of which a cryptocurrency payment is a part, counterparty risk is not reduced vs. a physical cash tx (it is vs. check or credit card). There will be many financial txs for which blockchain-based smart Ks will reduce counterparty risks.
![Giacomo Zucco [I identify as a -e^iπ vampire]](https://pbs.twimg.com/profile_images/1172971162919415813/Pn8O2gkx_normal.jpg)
