Maybe people would be confused and not understand the difference between "new multiplayer game" and "new singleplayer game", thinking they get locked in, but I believe an equal (or greater) number would be confused if there was only one "new game" with no difference between single-player and multiplayer. So I see no net benefit in removing a button.
I don't see confusion when there is only one button "New Game" because there is no other option for them to be confused about. Then when in the Character Creator they see a "Multiplayer Settings" button and ah ha moment happens.
If I were grading this issue, it would be a low "nice to have" one. With time running short I wonder how much room is open for nice to haves.
With Global Chat though we will see a lot of redundant early game questions, forever. If there is a real payoff, it would be monitoring Global Chat after release and whatever becomes common questions, perhaps a redesign or clarification in game is needed.
