The Tour Will Be Weaker Without Federer
Yes, he's gotten olderer, perhaps alot weaker, very much a tirer but something he isn't yet is a retirer.
Much like Murray, he keeps the tournaments alive and there's always the QF and SF presence, so he's got a few years left until others prove they've got the Wilanders to beat the top 4.
French Open W (1974, 1975, 1978, 1979, 1980, 1981)
Wimbledon W (1976, 1977, 1978, 1979, 1980)
3 Channel Slams; 4 Consecutive RG; 5 Consecutive SW19