[[B5]Londo]

The current war system doesnt work like that at all. Declaring a war does not affect both sides, only those who declare it. They get increased cap on their chosen target, and reduced on those who are not.
But this does not protect their victim from other alliances in any way.
If not being part of a war reduced the cap of 'random incs' ie the supporting allies in the current gangbang setup, then that would certainly be a major change.
However, this would simply encourage all allies in a block to declare war at once and all have raised caps, the gangbang would just be quicker!