This is great for the game.
It is too boring when it is 1 guy, or even 2 or 3 guys monopolizing all the slams and big events. Now we have Fed, Nadal, Djokovic, Murray, Tsonga, Delpo, Berdych, 7 legit slam contenders.
Golden age, I say, regardless of who you root for. More guys challenging for the biggest prizes is GOOD for the game.
Tsonga and Berdych are not Slam contenders any more than they have been before. Delpo seems to be making proress, which is good, but let´s not get carried away. He made to the semifinals of a tournament of best-of-three matches. That´s still far from being a Slam contender.