Considering the only apparent difference between the two is method of control and people love complaining about voice analysis miscomprehending I doubt there is much distance between those two terms in most consumers minds. I think in general marketing loves slapping "smart" in front of other nouns and it's usually received a lot worse than they expect to the point where most consumers ignore it as much as other fluff terms like "Next Gen".
The difference for me is a lot broader. A wireless speaker to me mostly means a bluetooth speaker. A smart speaker means internet connected, firmware updates, feature-creep, TOS/EULA crap and a probably-sooner-than-I-expected end-of-life.
