Vedit's fate needs to stay the same, but anyone expecting them to keep the squid monster is just being unrealistic. Having Veidt blame it on Dr. Manhattan is a lot simpler, and will allow them to cut out the entire subplot of the island and the telepathic alien. It's just as effective to have it be Doc M.
But really, Vedit MUST live. I cant express how disappointed i'll be if he dies. So... cliche and boring. Besides, the "nothing ever ends" line is just too good to miss. Hopefully WB sees the light and lets Snyder go with that ending (because we all know if Veidt lives, it's a studio decision).