[dirtboy]

You need to stop looking at the orbital paths in a two-dimensional manner. Ison’s orbit is well outside the ecliptic. Earth’s orbit will not intersect that path as a result. There is a perfectly normal explanation for ISON’s disappearance, but that never stopped the internet conspiracy mongers from making up absurd explanations and peddling them to the gullible.

[Yosemitest]

I understand three dimensions.

What you need to understand is:
We don't know WHERE Ison's debris IS.
We don't know HOW Ison disintegrated.
Was it a crumbling,
or was it an explosive disintegration cause from highly pressurized gases (heated to a high pressurization by the Sun's heat and radiation) inside the nucleus of Ison?
We don't know WHERE Ison disintegrated?
Did it happen BEFORE Ison started its "Sling-shot" around the Sun,
an thus, requiring a smaller change in its path to cause a danger to Earth?
Did it happen during the "Sling-shot" around the Sun?
Did it happen after the "Sling-shot" around the Sun?
IS the "V" pattern observed in its departure from the Sun just a "V" or is it a "Cone" shape shrapnel pattern that continues to widen as it travels through space?

I have no confidence that Earth is out of the danger from Ison's debris trail, just because Hubble didn't observe anything.
I have a very good friend that worked at Kwajalein Space Communications And Control Facility, who maintained their radar and long distance communications equipment.
He left there in the mid to late 80s, and he told me that the equipment of his day could not get a return on an object 500 feet in diameter
(depending upon its makeup, whether metal, an asteroid, or comet debris) until it was within 50,000 miles of Earth.
Now I know that technology has only gotten better since the 80s,
but at Ison's debris' speed, that's only about one hour or two hours at best, early notification that we're in danger of a "near miss" or an impact.
That's not enough notification to really do anything about it
unless we have people standing and waiting at the ready to react to an immediate notification.

But you're so confident that we're not in danger.
You obviously never fired a shot-gun blast of pellets, have you?