The point he's missing is that we're in a global village. If your friends watch it, you'll know what happens because they will talk about it. Maybe you won't care, maybe you will enjoy it a little bit less with no suspense - depends on how social if your typical series watching.

I don't see anything wrong with the approach though. Noone's saying that people won't buy the series on netflix once it's finally available. Although we know how likely that is...