If Nader is serious about meeting his own pre-requisites, then it seems very unlikely that he'll go through with it. No matter; we're in for another round of folks gnashing their teeth and getting their tits in an uproar over Big Bad Ralph interfering in, um, the democratic process. It's a perfect complement to Nader's increasingly malignant, incoherent narcissism. Edwards probably wouldn't have had anything to do with him, but surely Kucinich would have welcomed any practical help and support Nader might have mustered. That doesn't seem to be part of Ralph's agenda.
But no matter. Come summer, if we are faced with a nearly indistinguishable contest of Hillary vs. McCain, and Ralph keeps buzzing around, we'll get the usual litany of how if we really cared about the possibility of avoiding the more regressive agenda, we'd just suck it up and vote for Miss Thang, even if we still have no idea exactly what she'll actually stand and fight for (how 'bout Kyl-Lieberman 2: Tehran Boogaloo), and what she'll have to break out her trusty political anemometer for to divine which way the winds are tacking. On the other hand, McCain will be perfectly clear, even when he's pulling shit out of his ass, thus attracting far more fence-sitters.
But people will still find a way to blame Nader, or blame Diebold, or whatever. It's easier than admitting that maybe the system has failed utterly. Because even if Hillary wins, as with the Big Demo Wave of '06, a lot of people will be left holding their dicks and wondering where the promised follow-through is. It's in your hand, bub. You're lookin' at it.