Well, there's a sensible part of the anarchist tradition which is about "building the new world in the shell of the old." Incremental increases in autonomy and self-management.
There are grandiose, utopian "visions"... but vision has a special place, in the context of not repeating mistakes of the past. I mean, how arrogant are we to expect that we wouldn't repeat the mistakes of earlier well-meaning people whose work led to Soviet-like nightmares? Therefore a willingness to look at where we're going is important... with an understanding that any model, be it classical physics or Parecon, is likely gonna be flawed somehow.
Tayssir