It sounds good on paper, but when you actually get down to it. A scope like that would possibly make the gun LESS accurate.
The way I understand it, Image stabilization visually dampens movement. It doesn't really physically dampen it (digital, not gyroscopic). Now, if it only visually stabilizes an image, the there would be a lag and angular difference between the picture in the scopes reticle and what the barrel is actually pointed at. So when you pull the trigger, you'd really be aiming at a spot other than what the reticle is transmitting to the eye. Now, if the scope's image stabilization was somehow connected to the trigger, then that would be a different story.
Now Gyros make lots of sense. So much in fact that the military has been using them on tanks, missiles, rockets and ship based guns to keep them on target. I think they'd work fairly well, in a limited fashion for airguns. But, the gyros would have to have fairly large flywheels in order to compensate for the large swings of a rifle. This adds WEIGHT. It would also make it ALLOT harder to move from target to target or track a moving target with any kind of speed. On a Bi-Pod or on the bench you'd be golden. But I wouldn't want to carry that set-up for long periods of time in a hunting situation.