It might be fun with variation but all that happening means a golden era of tennis would be over. In their peak these top players just wont give any slam to the likes of Ferrer (!) and Berdych/Tsonga.
But Berdych and Tsonga are huge talents who deserve slams in my opinion, it would just be mixed emotions if it comes at the cost of Nadal retiring and Federer barely able to defend anymore and Djokovic just mentaly and phsicaly drained from all grinding at 26-27.
Soderling winning 2013 RG would really be more worthy than Ferrer, it really would leave a smile on my face.
Tsonga has too many glaring weaknesses in his game to win a Grand Slam (backhand, movement, ROS).
That's sad because he has the serve, the forehand,the net play and the agressive and strong mindset required to win a GS.
But with defenders of the quality of Nadal, Djoker,Murray or even Federer, it's fucking hard for a guy like him to win a GS.
He and Berdych probably would have won at least one during the 90's.