Right, but when Scherzer retires, their next best option will take his place. Could be a guy in their system, or a free agent. The league will not fold because one player retires or leaves. The point is that Scherzer is a generational talent whose performance cannot simply be replaced by some random pitcher. The Nationals will lose more games when he retires and as such less people will show up to watch them. A league filled with random dudes is not going to be as good, exciting, fun as a league with guys like Scherzer, Betts, Yelich, Sale, etc. etc.