A more likely intended meaning behind that passage is that God predestines people for eternal life or not. At the risk of contradicting my point about not looking for a coherent message in the Bible, we can see this same sentiment echoed in many other passages such as Romans 9 (we're all "pots" and the "potter" will designate us for whatever purpose he chooses) or the Book of Job (don't judge God's actions unless you're as mighty as God).But that wouldn't be consistent with the teller of the parable's point of view then. I'm simply saying that one can take any metaphor and make it say something absurd, if it's read literally. So I don't accept that would be a valid interpretation of what the parable was meant to convey. I wouldn't even consider a "Freudian Slip" in the mind of Jesus. It's think at best, it's a clever political interpretation, but nothing to seriously consider.
Really, the message of this parable is something like "Christianity isn't about universal salvation, and that's just the way God wants it."