WWE hired Bill Goldberg as their viewership was falling. No doubt there is huge amount of fans of Goldberg. It was all because of old wrestling matches that people watched. Many people wanted to see Goldberg back in WWE and on different occasions Bill Goldberg was asked again and again if he will come back to WWE. But Bill Goldberg does not seem to return and pointing to his age, he tried to convince people that that time has gone now, now he has grown old. Of course every athlete loses his power and fitness one day.
Despite all these facts WWE wanted Goldberg back so to make return all those past WWE fans who had become bored and had stopped watching WWE.Everyday there were the same faces one after another so that's what WWE chairman Vince McMahon realized and so he wanted someone who could be a turning point in WWE viewership.
It was Goldberg without any doubt because he is considered a Hero and Power Bank that WWE ever had.
But the match between Bill Goldberg VS Brock Lesnar was unfair because:
1) Bill goldberg has grown old now
2) He is not in shape that he used to be 12 years ago
3) Brock Lesnar is 10 years younger than Goldberg
4) Brock is a trained MMA fighter in real life