That said, I don't think acceptance by dark markets is something to seek. Most of the DNM stories have been tragedies, leaving confiscated coins and ruined lives in their wake, and I predict the next major dump of XMR will be thanks to a FBI seized assets auction. Too centralized and too big a target, plus the cumbersomeness that comes with operating and using a dark site. It may be obsolete tech now.
Thats a one way of looking at it. Also keep in mind that Satoshi is in FBI's and several other agencies most wanted list. Shadowmarket, if it will ever become a popular demand, might cause troubles to their devs due to illegal trades going on. On the other hand its no secret that FBI decoded tor and watching people.