What would the point to point range of the current Virgin Galactic Spaceship 2 launch system be?
This is going to involve a lot of speculation! 

I'd guess that White Knight Two will have to fly at approximately airliner speeds once it reaches altitude, otherwise it will stall in the thin air. Total flight time of the combination is expected to be 2.5 hours, which gives a range of about 2500km (if we optimistically assume it does Mach 0.8 the whole time, the initial climb is likely to be much slower)

Spaceship Two is projected to have 6 minutes of freefall and a top speed of 4000 km/h, so that's another 400km. If they thrust at an angle rather than straight up the top speed may be higher but the flight time will be lower, so I think it's a reasonable estimate.

If it starts gliding from 50,000ft (15km) and has a glide ratio of 5:1, it can cover another 75km (so picking a glide ratio out of the air has very little effect on the total)

I doubt anyone will pay $250,000 to fly 3000km at basically the same speed as an airliner.