We are in the same position. We are moving over in January, and our 10 year old wasn't overly impressed! He's had 2 months now to deal with it (we aren't even having a holiday out there first we're just going), and he realises that we are doing for the best, to make sure he has the best life possible. He came round more and more, as he told his friends and they all said they were REALLY jealous - peer pressure can be a good thing
Hope your son comes round soon!