My guess is that Halo2 is being designed specifically for DX10. It's much easier to port over a console game using the same underlying graphics foundation than to rewrite code for older graphics. This basically means that designing/coding/testing for DX9 would take enormous resources away from the DX10 version, which in the end would translate to the same release date as Duke Nukem Forever. In other words, this petition is a waste of time.