You are aware some elements of certain laws in the us pertain to obscuring source of ...
what is that name for?
Mixing coins is perfectly legal:
Mixing Bitcoins that are obtained legally is not a crime[...]
So I don't see why something like this, which won't even be a centralized service, wouldn't be.
Would SNICKER (Simple Non-Interactive Coinjoin with Keys for Encryption Reused) render all other Mixer services useless?
It's too soon to tell, but the fact that it requires some interaction between users may dissuade some people. Instant gratification is preferred if available nowadays. Either way, the more privacy options there are, the better for us.