Originally Posted by TechnoViking
Nadal will return and win RG, and Wimbledon is possible with a good draw and some luck, but he is done at winning anything above 500 on hard. The sensible thing to do would be to only to play enough HC tournaments to maintain a top 4 ranking and consequently save his knees and prolong his career.
If he returns to his prior top level then he could definitely win another slam on hard. It won't be any more or less likely than it was before, which is to say, it will still be very difficult for him and he'll need things to fall in the right order.