Here is a much better idea......
Let UA have US-East and CO have US-West. That would leave American with having to either buy Alaska, AirTran or Frontier. Therefore you would have the best outcome and would shrink from the big seven to the big five and you aren't left with just three mega carriers.
UA and US East would have a truly national coverage.
DL and NW would have the only truly global network
AA and __ would then be to counter the remaining.
CO and US West would have a truly national coverage
WN would be the other, but with limited states, (MN,HI,KS,GA,MA,WI,IA,SD,ND,WY,MT,NC)
If AA were not to go to the ball, maybe Midwest Airlines, AirTran, JetBlue and Frontier could all come together to form one final airline.
By the time all the chairs settled, you would be left with five or six, long term stable carriers. Yes airfares may go up but why should the airlines be around for public transportation? Airfares should go up, didn't your gas for your car go up by 33% in the last year, and yet airfares didn't follow the same amount. If they did, I couldn't get a ticket to MCO for around $200 round trip before taxes for Christmas.
Also, in 1978 didn't we only have four trunk carriers? TW, UA, AA and EA with the other carriers being just labled as regional?
JMO