A lot of this topic has become tl;dr for me, as it often does when dumpshock does it's usual thing. Nevertheless, whether or not teleportation is possible, with magic or technology or rubber tubing, let us consider this. If point-to-point instantaneous teleportation is impossible/ridiculous/upsetting, what about making wormholes? What if you made a spell which took part of the space of one location and stretched it to another, so you could step from point-to-point, not instantaneously, but a lot quicker. Much the same way as EVERY SINGLE PHYSICIST ON TV likes to bend pieces of paper to represent spacetime. (Seriously, show me a physicist who talks about spacetime and doesn't use that analogy.)
only the ones living in their own heads. Those do seem to be the ones that get on TV though...
The problem with that analogy is that it is used because it is a solution to general relativity, which by itself lends credence, but when one actually considers the solution the problem eliminates the solution as possible. That solution requires the existence of negative mass (I think it can work with imaginary mass as well). Negative mass would violate in all the worst ways the laws of thermodynamics because it would create energy and create it at a stupid high rate. What that means is there is no solution to general relativity that has wormholes or anything like them.