Even someone despising CIG can be impressed by the graphical tech aspect of SC and what have been done in this domain. It's hard to deny them some efficiency on the graphical part for a game of this scale...
There is a difference between someone saying "Yeah, that's pretty nice" and "Oh my gooooood, i'm almost there... show me more!!!!!"
If CIG take much longer, their assets are not going to be next-gen, they are going to be last-gen.
We've already seen how they have had to updated (in some cases multiple times) older assets, due to either changes in how the engine works (Object 2.0) or because the old models were looking decidedly dated.
The longer they take, the worse it will look upon release.
But the hardcore fans keep up the rallying cry "Take as long as you want Chris, we trust you!" and if those types of people are the ones CR and CIG listen to, then nothing will ever get released, because they will have to keep updating assets over and over and over again.
You have to draw the line somewhere and say "That's good enough" and there is still so many things missing from SC that was not only promised, but actually sold to backers, they have to focus on that stuff or at least tell backers those things are not going to happen.