People will not flock to him no matter what.
People will not go see his movies no matter what.
His ego demands he be in the public eye. Arnold is very smart and has been an opportunist a long time. He'll never let an opportunity like this go to waste. I'm sure he has plenty of gay and lesbian friends.
Yes, he has many gay friends and has always been in favor of gay marriage, even long before this supreme court ruling. Its no surprise that he was in favor of it.
And, for the most part, yes, people will go see his movies. You give too much credit to the American people. Most of them are too busy with their iphones to know anything. Arnold is a living icon and people will flock to his movies. They may not be BLOCKBUSTERS like they once were, but his moves will still garner attention. Hes not going broke any time soon.