If it ain't broke don't fix it right? That's exactly the kind of attitude that causes a series to go stale. I'm astoundingly bored with the weapons in Wipeout, there's nothing really new in there since 2097. Only Fusion really attempted to add new and innovating ideas to the roster.
I agree that there should be only ONE "super, all ship affecting" weapon (the Quake - don't like the idea of Ion Cannons myself), but a teleport is hardly a super weapon and definitely fits in with the sci-fi theme of the Wipeout series. It wouldn't give a player too much of an advantage, it would just give the back runners a bit of a chance - it's not like they'd teleport right ot the front of the pack is it? That would be ridiculous. And like the quake, you could make it a rare pick up.
That's my opinion anyway...