I think that there is 0% chance that everyone will agree to move Christmas to June. Who makes that decision, anyways? The Pope? The Archbishop of Canterbury? It's an interesting idea, and certainly would save lives, but there is no way that's going to happen.
I admit to shopping at home shopping channels on occasion. This year they had Christmas in spring, Christmas in July, Black Friday in September, Christmas Preview in October, Countdown to Christmas in November and Only Blank Remaining Days to Christmas right now. So June, why not?