In the original game, the conduits were spawning points.
Wouldn't it be awesome if the conduits could be used for travel? It's not just getting in and getting out on the other side, but actually going through another dimension, where you can fight other people too.
You could implement Conduits in an MP map as a quick travel system. Similar to how Halo uses their "elevators" to give people quick access to vertical maps, you could use Conduits to allow quick access to far corners (or heights) of a map.
I think it was Halo 2 that has a teleport system on some of the MP maps, it worked very well. You could easily put Conduits into MP maps and have it work beautifully if the maps are built around them, and they are not added after the fact.
Do unto others as you would have them do unto you Basically, if you get spanked, turn the other cheek