It seems that over the last couple years, the Survivor Series PPV has come into question as being antiquated. Others have mentioned that the show has lost its original focus... that being team-based, elimination style competition. "Traditional" Survivor Series matches are not featured prominently on the card anymore and when they are, they take a backseat to other non-team contests.
In an attempt to resurrect the "theme" of the show, I would propose a return to 4 vs. 4 or 5 vs. 5 team-based matches. The difference would be that they are all contested under "War Games" style rules. That is:
1. Two rings surrounded by a double-wide steel cage with a roof on top.
2. Instead of eliminations, teams are introduced one participant at a time with a member selected from each team to start. A coin toss or some other contest is conducted beforehand to determine who will have the advantage as new participants are introduced.
3. The first new particpant enters at the 5 minute mark, providing a 2 vs. 1 advantage. 2 minutes later, the next particpant enters making things even at 2 vs. 2. The match progresses with 3 vs. 2, 3 vs. 3, 4 vs. 3, etc. until all particpants have entered the ring.
4. Once all participants from both teams have entered the ring, submit or surrender rules apply. Pinfalls, DQ's, etc. cannot achieve victory. The match ends when one of the teams members either submits or is rendered helpless (ie; knocked out, requires medical attention, or otherwise can't continue).
Though it would have to be significantly tamed down for the WWE's PG rating (ie; no blood, excessive violence, etc.), the concept itself I think is still sound. It should add a new dynamic to the traditional Survivor Series formula and could go over well with longtime NWA/WCW fans that remember those matches. The fact that WWE owns the trademarks to the name "War Games" adds another layer of authenticity that something like "Lethal Lockdown" can't provide.