I've flown too, and I crash each and every time...just like the scramjet. Albeit the scramjet makes it a bit higher than I can. They've just never managed to design one yet that can possibly survive a test flight. Their current designs are flawed and they know it. I'm not poo-pooing the idea of a scramjet entirely; they're just not quite there yet.

I thought we were talking about this from the standpoint of a spaceship, as in one involving passengers (hence the need for a return trip).

Also, it will drop below super-sonic as soon as it hits orbit. Orbit = no oxygen = no combustion = no scramjet propulsion.

Now railguns on the other hand are fun toys :)