You know, I still haven't seen a good reason why this idea couldn't work. The people who don't like this say the idea of an alien parasite is unoriginal or too gimmicky even thought it's going to be in the game anyway. This could make the virorbs a plague that is feared rather than just an enemy you would occasionally come across. Im pretty sure that when he said that they could be the next flood he meant that it could be a unique parasite that is exlusive to this game and has it's own backstory. I don't think he was saying he wanted to directly copy the idea. And speaking of unoriginal, do you know that Creepers are going to be in the game too? Mobs don't need to be randomly generated to be good.