If he continues to win on all surfaces, except clay, it's just a matter of time.
If he breaks through at the French - NEXT year, it'll be sooner.
If Nadal steps up on other surfaces - or someone else challenges Roger on those surfaces - than he's still in the running, but not a sure bet.
His championchip mental approach should have him ready for Wimbledon. Then, momentum will be back on his side in the "best ever" discussion.
P.S. - I'd like to see Macca have breakfast at Wimbledon!
"Step on the gas and wipe that tear away,
One sweet dream came true today!"