While I can't even remember ever turning on the top LCD's backlight in all the years I had my 5d2 and now 5d3, I can see why this would be a problem for some... I mean, why else would they even have the backlight if certain photographers didn't need it?
Does suck I'll probably have to get my camera repaired for something that will absolutely not affect me. I just wouldn't want to hurt the resale value by having an unfixed first batcher. Gives a new meaning to beta cam!