RJ seems like he's pretty set on using gateways for one purpose: Traveling. I find it vastly unlikely that, of the hundreds (even thousands possibly, including the Ashaman) who know the weave, none would have thought of using Gateways for other purposes.

We've had a lot of fun on wotmania coming up with fun uses for Gateways--ways they can create seemingly physical paradoxes, get around some of the laws of physics, etc.

The potential power of a gateway exceeds anything we've come across. Amongst these are:

1. Limitless travel to anywhere (the usual)
2. Perpetual motion machines = infinite source of energy
3. Unlimited scouting ability from any viewpoint.
4. Possible time travel, using gateways in the sense that people envision wormholes to enable time travel

There are many others, of course, and they're fun to dream up, but I can't see them being used in any other way in the series. It would open too many doors.