I honestly don't care who wins or who the name goes to, as I don't have and have never had any interest in playing DOTA. I'm just baffled why Valve would want to name their game that. It seems like you'd generate more buzz pretending like it's a totally new concept than you would trying to foster brand-recognition from Warcraft III players who were probably already aware of your game anyway.
Why the hell not? Team Fortress, Day of Defeat, Counterstrike.