TNA did a 1.0
WWE had a 3.4
This is the worst case scenario for either company. The Monday Night War was popular, because it helped both companies grow. WCW and WWF were essentially competing for a viewership of over 10 million people. Hell, the NWO and Stone Cold made it cool to watch wrestling again.
What these numbers tell me is this might not help either company as neither one of them truly gained an increase in their ratings. With a smaller audience to compete for, they will both end up taking each others viewers, and it will ultimately be bad for both of them.
In the long run, the WWE will win because they have a much larger revenue stream than TNA. They get more money from the gates at house shows, more PPV's buys and merchandising. WCW was backed by the juggernaut known as Time Warner and they could afford to hemorrhage money. TNA is backed by a company named Panda Energies or something, they won't be able to take the amount of loss that Time Warner did. ...
As of right now, the WWE stands to win it unless there is a cultural revolution about wrestling, which can help both companies grow. Both creative teams need to step it up.