Very few players symbolise their era better then Robson and Keane.
Robson came from a generation were everything was taken to the extreme. They worked hard, they played hard and they partied hard. In their mindset there were two parallel worlds ie their football career and their private life. They were committed to enjoy the most out of both. Of course what happened in the private life did effect their football life. If you watch EPL of the late 80s early 90s you'll start wondering if someone had actually pressed the slow motion button. There again that's the way football was and Robson was no different to most players in the EPL of the time.
Some might think that Keane is an arrogant brute but that's not the case. We're talking of a man who allowed Clough to punch him straight to his face without reacting to it. A man who didn't sent his CV to United as a kid because he felt he wasn't good enough for us. You see, Keane came from a different generation to Robson and the current crop. Football had evolved pretty much to what it is now ie players of Keane's era knew that drinking isn't good for their career, that you have to take care of one's self to be able to give your 100% etc. However they still retained most of the values of the previous generation. Seniority was key and players can only become legends if they bleed for their club. And that's were Keane had issues with. Once he bled for United he expected all the rest to do the same. Respect had to be earned on the pitch, the hard way and must be proven every single time by constantly playing top football. He never forgot Queroz for leaving United to go to Real and he possibly didn't like the fact that Schmeichel would come back from preseason in top shape and he would need months to shed his access weight.
Would they survive in football with such attitude. Surely not. Robson would probably be lingering at Everton (that's were alcoholics go these days right?) and Keane would trigger an open revolt which would give the manager no option but to sell him up or see the team's performance go to the shitters (which I suspect is why Keane lost his job with us in the first place). However, would they have that same mentality if they were 20 year olds playing EPL football? I doubt it