This thread appears regularly in various guises often (I hope) with a fair degree of tongue in cheek. There is a serious point in here somewhere though: if there is to be further discussion about the future of the Army beyond 'Future Army 2020' it should take account of the ability to regenerate numbers in the Army relatively quickly.
The modern Army is a much more technically focussed service than it was but it is still easier to increase (especially infantry) numbers more quickly than it is in the RAF and RN, where the force elements are hugely technical and require a much longer training pipeline. In a world where budgets are squeezed and manpower is a huge chunk of the pot it is worth considering whether we could make a considered risk here, especially given that wars of choice are more likely than wars of need for at least the next generation. Of course we will always have those saying that (a regular army of) 82000 is not enough already and in a world of full employment, a buoyant economy and large national surplus they might be right...