Of course it would be a good idea to bring the war games to the wwe. It was always an interesting match concept. It also, as stated, would make sense to have it at survivor series. You don't even need to make a war games ppv. Just have the one match at survivor series, and that'll be enough. Sticking on this topic, I do wish the wwe brought some of the concepts of wcw to the here and now. Although I know that wwe(more importantly mcmahon) hates ideas that don't come directly from him or his own creative, so I don't see it happening. I wish that the wwe brought back the Starrcade ppv. This was, for all intents and purposes, the wrestle mania of wcw. It would be the perfect opportunity to place this ppv in june, to replace the night of champions ppv and eliminate the one night stand. It would create a major ppv every 3 or so months. The ppv wouldn't change with any type of concept. It would just change in name, and in essence create a presence of the majestry of such an event, feel the history.
Aside from this, the only other thing I would like to see brought back is the world war 3 concept match. I loved having 3 rings, 20 men in each ring, and battle it out until there was a predetermined number of competitors left(I can't remember how many) and putting them into a single ring and having them duke it out with the last one remaining being the winner(ala royal rumble). It would definitely work with the wwe as it is with their being 3 brands(though I don't think ecw even has 20 active wrestlers). It could be a battle to show brand supremacy(ie 3 rings filled with 20 guys from the same brand, they battle it out until the best of the best from each brand is left, put them together to see who is the best and so which is the best brand.)