no they cancelled it because thats impossible lol. you can shoot a satellite with a suborbital object but thats a loooong way from the projectile being orbital.
Nah, it's not that long a way. You just need to adjust your goals, add an extra stage, accept a much smaller payload.
If you can get a payload to space, you could put a payload 1/4 its mass into orbit with an additional stage.
I mean, the anti-sat F-15 test was pretty wild. But is arguably less wild than other airlaunch systems like the Pegasus or spaceship one. Saying that airlaunch is impossible is silly, because it's happening.
These systems get cancelled because they're expensive and complicated and reusable rockets are cheaper and easier.