Didn't he go further this year than any other year? He didn't win USO on first attempt either, luckily didn't have to wait very long
Waited 3 years from his first final at the US Open. 3 years from first RG final would work for me too - let Nadal get a couple more.
Sure he'll get it before his career's over and hope he does too - deserves it based just on his clay level.