Why would we not see players like these again? Every generation has its great players and frankly there is no way to prove who is better. I grew up in the Maradona era, and I think he was way better than these two guys, and even so I don't think Maradona was the greatest player of all time, hell even when he played I can name a few who were up there with him. This is just a perception thing, nothing can be proven, like Ronaldo and Messi you can't say this one IS better you can only have an opinion. Now you can say X guy is the greatest goal scorer of all times because he scored more goals, this is quantifiable, but who is the best? No that can't really be answered. All you can say without a doubt is that both are great players.

Apart from this remember football evolves, better balls, better equipment, better pitches so it is reasonable to think we should be seeing better conditions for skilled players, so I do think we should be seeing some great players in the future who will also be held to be "the best of all time".