The reason I think Shayne put this in, and I agree with it, whether or not I like it, is because now by meeting Clark and sort of getting him to break up with Lana, she's changed history to the point where the correcct timeline's events are implausible, therefore she can't remember what should have happened.
All this means is that we just might see Herbie.
I think, therefore, I get bananas.
When in doubt, think about time travel conundrums. You'll confuse yourself so you can forget what you were in doubt about.
What's the difference between ignorance, apathy, and ambivalence?
I don't know and I don't care one way or the other.
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