Did WWE learn nothing when they tried to bring back The Great American Bash back in 2004? You wanna talk about buyrates and ratings go check that shit out. Now as for the Wargames, well I'm not sure about putting it near the Survivor Series due to resembling a huge team on team match. If they stuck it maybe in the pre-Summerslam months then maybe that would be alright, it would make it a B-PPV but still.
As for it replacing Survivor Series as one of the Big Four... no. I like the Big Four because the events have a lot of history behind it, and it's the only 4 PPV's that didn't have their name changed to compliment the monthy gimmick matches. Why ruin a good thing to hold an event for a match that really isn't interesting in the first place, sorry to say.