So what if the Yahoo article is depressingly realistic. That's not what I'm here for. Another word for SF fiction is "Speculative." So I speculate. Sure, there's no *evolutionary* reason for me to be blue and shapeshift...but evolution doesn't figure in the, "damn, that's cool" factor. It's the difference between impossible and possible...plausible is another story.
In my SF, Fantasy, and Speculative fiction, I don't expect plausibility to make absolute scientific sense given current standards. Current prevailing theory says that you can't go faster than the speed of light, so interstellar travel is going to be a long and arduous journey of extended time periods. That just doesn't work for me. In science, plausibility is a different thing than it is in fiction. In fiction, give me the possibility - tell me that it could happen, and let me worry about making it plausible.
And if I get to make it hot, too...then well, that's just frosting. ;)