Nadal will never reach no 1 again.
Unlike others I'm not going to write the guy off and I hope he does manage another three or four seasons. However, even if he does manage another slam or even two they will only be on clay and he will be more of a supporting cast member in the other biggies. I can see him floating in the top 10 but it's hard to imagine him recaptuing the top spot ever again.
“There is no best. There is just the discussion of who is best. Federer, he will always be in the first part of such a discussion.” Rino Tommasi