Original: The idea of a supercard featuring the two top promotions of the Monday Night Wars was considered to be a "dream match" scenario in the eyes of many fans, as it would allow the fans to see which promotion would be kayfabe superior.
Simplified: The idea of a match showing the top 2 shows of the Monday Night Wars was considered to be a "dream match" show in the eyes of many fans, because it let fans to see which show would be superior.