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Any aging industry has to worry about new customers. You're always going to lose your old customers whether they move on or die or what and you need new blood to replace them.
Take a child born in 2000. How likely do you think that child will pick MMOs as his main source of entertainment?
There are a lot of entertainment choices. Young people might go into League of Legends, many play Minecraft, and there are a ton of first person shooters.
Is the MMO industry in danger of losing millions of subscribers? Meaning MMO players leaving faster than they can be replaced?
Or will young people eagerly join MMOs today as we did way back when?