I really don't think WB is worried about opening against X-Men. First Class was a good film, but not that great. I know plenty had issues with it. Not saying their wont be a sizeable crowd going to see it, but I think when it comes down to it WB know that LOTR fans will choose The Hobbit over X-Men. As will all the people burnt out on superhero films who are looking for fantasy. I just don't think X-Men will do the Hobbit that much damage. Its a competion and may the best win. If Fox is worried they will move as is their choice. If not, they can stay where they are. WB on the other hand has absolutely no reason to move. This isn't about being courteous. It may have been a dick move on WB's part, but you don't get to where that studio is without making these choices.