Voldemort is a fool. While I don't approve of killing children, and thus find it amusing that his attempt to kill an infant turned him into a powerless wraith, he made a fatal mistake in the fourth book, one which I believe might have been out of character for him, given other things we know about him. His mistake was letting Harry have his wand. Why did he not simply kill Harry while Harry was still tied up? Yes, he was supposedly repairing his reputation among his inner circle, but frankly, that was unnecessary. Someone whose name still inspires fear 13 years after his downfall and disappearance does not need to bolster his reputation.
Voldemort strikes me, in all the rest of the series, as being someone who does not hesitate to blast obstacles out of his way. He already knew he could not convert Harry, so why did he not kill Harry when the boy was helpless? Voldemort is arrogant to such a degree that he is unlikely to have been cautious with Harry before the wands connected during that scene.
It would be interesting to read a fan fiction AU where Voldemort did not hesitate to kill the prone Harry. Or hesitated just long enough to show his Death Eaters the act in person. Obviously, it would have caused him to pass out when he killed the horcrux inside Harry, but what beyond that? I suppose Dumbledore's plans might change, once he realized Harry was no longer a horcrux; Harry would no longer need to die, because it would have happened already. He would no longer have the connection into Voldemort's mind. Voldemort would still be wary of Harry, would still be obsessed. It would be interesting, to say the least.
This was cross-posted from http://fayanora.dreamwidth.org/1288865.html
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