It's a matter of expenses. Releasing disks means a lot of upfront cash to license, publish and distribute. DD means very little publishing costs, so it's much lower risk. Don't think of DD as an idea being forced on everyone, but an opportunity to extend gaming. Titles like XB360's Limbo wouldn't exist without a DD option.I say games like this should be on both disc and downloadable form. I don't understand the idea of trying to push DD on everyone...
Edit: Game looks kinda fun, although Batman looked like a damp squid next to GL.