Here it is (old revision of the page you mean):
top 3 is `only' 87 weeks to go, i.e. May 2014. Should be doable. Top 5 is 4 years to go, too hard to predict.
Federer missed out on the consecutive top 3 record with his blip to #4 last year. Consecutive top 5 perhaps... 3 years to go.