I think this move by JW Org may well be another case of shooting themselves in the foot. Most of the general public know next to nothing about J.W's and their wacky beliefs, a few know about Blood Transfusions, some do know more detail, but the majority I think probably are not aware that they do not celebrate Christmas and Birthdays.
My son was taking the piss out of his girlfriend a while ago, saying " You are the kind of sucker that would fall for the J.W nonsense", she has a fascination about weirdo Cults, she then asked him more about the beliefs, and with a laugh replied, " Well they won't catch me then, I love Christmas and Birthdays too much!"
I wonder how many more of the public share her views ? she is not religious in any way, never has been, but Chrissy and birthdays are important to her and to her family.
I agree with the above that the Aled Jones version of the Song is a lot better than the original !