A theoretical fixed platform, that is.
You are correct in pointing out that, right now, there is no way to create such a thing a thousand miles up. Of course, there are no "geostationary" orbits at that altitude, and the rocket propulsion required to haul a payload straight up for a thousand miles by brute force would be stupendous.
I suppose some day somebody could jump off the side of a space elevator, and reach terminal velocities that would require real heat shielding before you hit sensible atmosphere, but I don't think this is going to be a near-term issue.