It's unlikely the XBox 360 or PS3 meet the system requirements for the GECK. In both cases I imagine they lack sufficient memory - their hardware is streamlined to play games, not juggle large amounts of information. If the hardware wasn't a limiting factor you'd still have software issues to contend with. The GECK is a Windows Application - not an application that runs
in Windows but an application build around basic Windows architecture - and even the XBox doesn't have this software support. This would basically require that the GECK be rebuilt from the ground up. PC users get the GECK because the developers have built it for their own use and preparing it for public release doesn't require too much additional work - having to effectively re-make would probably carry a price tag and just imagine the complaints about PC users getting the GECK for free while console users have to pay for their editor, which probably can't handle as much too boot!
Of course hardware and software aside neither Microsoft nor Sony seem thrilled with opening their systems up to user-made mods unless it's with a very narrow system (like Halo and Little Big Planet). Sony seems more supportive . . . . or at least less against the concept . . . but I still don't see them on board with something like this.
Just for kicks, here's a noble idea, from a PC user:
why can't a mod be made on the PC and then transferred to a console?
You mean like Unreal Tournament 2003?
Given how spotty the UT2K3 converter is I don't see something like this working for New Vegas. Unreal Tournament maps are loaded and played individually and they still have considerable problems being ported over, FO3/NV mods can be
far more complex since they are integrated in to the entire existing world so the chance of converting the files successfully would be even smaller.
Since this won't be happening, and there are so many hurdles in the way, I'm going to lock this. We've already had some people bring up hacking and related illegal issues and I don't see this improving.