you're right, there is no such thing as 'devolving', for devolution is the same thing as evolution; to say devolve is the same as saying evolve, only with different paths and trajectories.
by devolve, i mean evolve backwards, in a way.
But you are right; most scientists don't acknowledge the idea of devolution, for whichever path a species progresses(where we consider that path to be going forwards, backwards, left or right), its always the 'correct' path, and thus, is evolution.
and and the progression of technology itself isn't a good reflection of our evolutionary status, but, our technology is progressing along a metaphorical evolutionary chain.
ever read "Shadowrun" novels? theres alot of good eerily prophetic overtones; magic resurfaces, technology does 'magic' things, and humans begin to exhibit genetic variation to the point some people become dwarves, elves, trolls and orcs. Its like the future "Lord of the Rings". "Snowcrash" is also a good book that follows the lines of pot-apocalyptic America where government doesn't work, but rather corporations control the majority of sovereign nations, and infact become extraterritorial-soveriegn nations themselves..