"Hey DC, why don't you remake CS2D?"
It was answered countless times. Just think for a few reasons yourself. Here's a few:
It would be a lot of re-writing
It wouldn't really be worth it unless someone payed him an enormous sum (so enormous that he probably doesn't believe anyone would pay that)
He's working on something else
I'm pretty sure he'll reply anyways but I just wanna state that that question was SO needless.