Initially, I thought "hey, what a good idea" but after a quick look at the 1/2m, with important details stuffed in really tightly, I can't see how you'd get the information needed without getting rid of some of it and there isn't much you could safely ditch on the half-mill.
OK in places like Africa and Australia - hell, on the 2m you still get large expanses of nothing. In the UK with our crowded and complicated airspace, probably wouldn't work so well.
Anyway paper maps are so last week... Just pinch to zoom in and out, simples!