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My question is:

Is this activity specific to Earth's orbit?
Is orbital distance then a pre-requisite to habitibility?

Is this happening on Mars? Venus?
Do we see any evidence pro or con for the other planets?

Has anyone reviewed say, Cassini film/photo footage for evidence of such cometary activity?
Would there be similar photographic evidence to help confirm the theory?

It raises a hell of a lot more questions than it answers, IMHO...

Venus may be immune because the comets can't quite make the trip (more solar energy hitting 'em). I'd be inclined to think that it is happening on Mars at least. Mars' surface is cratered, but one half (the "Hemisphere of Craters") has many more, which suggested to at least one researcher (circa 1980s) that, when one subtracts the number found on the other half (the "Opposite Hemisphere" -- to clarify, these hemispheres are not related to the axis of rotation at all), the remaining number (the extra ones in the "Hemisphere of Craters") were formed from a single, very large, impact event, not dissimilar to the event that formed the Carolina Bays, but probably a bolide (a mass of mostly rock) rather than a comet. :') An object perhaps the size of Ceres (which was the first asteroid discovered, and still among the largest) is what that researcher hypothesized.

We barely have photo evidence for earth impact. I’m sure cassini does not have the resolution for detection on other planets.