Earlier quoted context omitted.
So you are arguing that "SimCity Online" does not sound different than a regular SimCity game, but "SimCity" does? Does not compute.
No I'm questioning why you are saying they should have come up with a different name like SimCity Online and start afresh when they did just that... But with the normal SimCity name. Maybe I didn't word it well, I'm running on 2 hours of sleep.
SimCity's been a single-player offline experience since its inception. It's reasonable to believe in a vacuum that a newly-released "SimCity" game will be the same.
Lots of people are in such a vacuum -- a LOT of people hear "A new SimCity game is coming out / has come out" in their periphery and, having enjoyed its past iterations, rush to buy the new copy. Their surprise in finding that it's an entirely online experience is reasonable here.
Calling it "SimCity Online" could have dampened this effect, causing some -- if not a lot -- of people to stop and think "Wait, what makes it Online? Oh, it's more like an MMO."