I think the 107% rule is fair. F1 is the pinnacle of motorsport to begin with, and if there are cars lapping around the circuit more than 5 secs a lap slower, they are nothing more than speed bumps for cars that are actually racing each other. Whats the point of an F1 car actually lapping the same circuit slower than GP2 car? The 107% rule is a good way to make the slower teams improve, or else, we would have tortoise teams just living off the glory of competing in F1 without actually being competitive. And its not like 7% is that unattainable, the top few teams are separated by mere tenths of a second, and nearly half the field is separated my just over a second and a half. So for a car to be over 5 secs off the pace is way too much.
If HRT make it to Australia, I expect a DNQ from Karthikeyan.