Only 1% of the player base will ever play Ultimate. More than 50% of the player base is midcore and will enjoy midcore content.
We'll see the Ultimate raiders clearing the Ultimate then doing nothing for the entire expansion and unsubbing. If you make good midcore content with longevity, people will play them the whole expansion. This isn't just good for the majority of players, it's good business strategy too.
Remind me why so much content is cut in favor of Ultimate, and why Ultimate raiders are still not satisfied and keep whining about other people's content like Male Viera?