Looking at the younger generation, it maybe easier than people thought. IMO, one will eventually reach and one 'll be close.
This. I don't see any serious competition for #1 from the youngsters for the next 2/3 years.
Assuming Roger loses the #1 ranking later this year (just an assumption) there will be at least 104 weeks at rafole disposal, if not more.
I guess it will depend on how they share the time at #1.
P.S.: Of course I would love for Roger to mantain the #1 until the end of 2012 and until Wimbledon 2013. It's not that farfetched really.