This is not far from how most of Sweden operates. Most offices comply to the idea of "half-day before holiday" notion and as where fixing the dates wouldn't interfere with that too much, I doo believe that fixing Christmas to a Saturday would make a lot of Swedes angry.
For one, we celebrate the 24th, and having the 25th on a Saturday sure gives Friday and half of Thursday off. But the 26th is also a holiday, which would then be on a regular Sunday. New Years Eve is not a holiday, and having that on a constant Friday would open the days between Christmas and NYE as a work week. Where as now some years you can have a nice long (10-14 days) vacation with only a couple days of actual leave, because the rest are considered national holidays. (Example: 2012 I can get 14 days off with only 5 days of leave.)
> Now, you can see conflicting interest here, especially between employees and employers :)
Why would there be a conflict of interest? The point is that employees always get the same number of "days off" per year is it not? The conflict of interest would arise in countries where holidays are not carried forward (or stashed in leave entitlements), employers interest would be to have all of them fall on week-ends, whereas employee interest would be to have all of them fall on week-days.