One interesting quote from the article suggests the two classes of stars that may be out there:
They find that those
systems with observed giant planets show no evidence for a
debris disc, whereas, those systems which display evidence
for a debris disc are not directly observed to harbour giant
planets.
If the debris disk was required for Earth to form as we know it, Earth-like planets may not be as common as we thought.
But really, who needs Earth-like planets, anyway?
I see a few obvious factors to consider. Confirmation is left as an exercise for the reading deities.
A variation on the Planetary System Poll: “Halo”.
Watch out for Dragons.
I hadn’t heard that – you have any links?