A common problem faced by both small and large groups is fighting outnumbered. For organized groups this is mostly a problem because everyone you kill gets revived when you have to move due to player pressure or siege.

I think a simple solution would be a revival timers:

1. Being revived with a soul gem adds a 30 second period after your next death where you cannot be revived by another soul gem.
2. This penalty is increased by 30 seconds per death and revival with a soul gem.
3. Every two minutes of survival removes 30 seconds from this penalty.
4. Reviving at a camp bypasses the timer, but adds 30 seconds to the penalty as if you had been rezzed by a gem.
5. Reviving at a keep bypasses the timer and removes the revival penalty.
6. Your revival penalty is visible to anyone who approaches and would be added to the "Hold [F] to revive player (x seconds)"

Think about a keep that gets zerged down regularly. We'll take Chalman as an example. Imagine if you killed a bunch of the DC that push up to the wall, they take their camp at the mine and rush back, but this time if you kill them, they are out of play for 30 seconds unless they ride back from bleaks.

The 30 seconds is sort of arbitrary and can obviously be tweaked, but I think something like this could help to bust up zerging a bit, or at the very least make the zergs a bit easier to take down overall. Camps remain important and useful, but now have a slight risk associated with them beyond loading screens.

This also seems like a reasonable thing to implement from ZOS's end since they already have sort of revival timers in IC and BGs