Like they did dragon riding?
Like they did the talent trees?
Like they did the new profession system?
Like they did the new year upgrade system?
They are making evergreen features and expanding upon them again, and they are commiting to 3 expansions of this and already have the groundwork for them done.
You are the delusioned one to think this is not the goal and has not already been proven to work with dragonflight.
We have gotten many evergreen features added that will continue forever now.
They arnt going to abandon the dragon riding, the professions, the delves, the hero talents.
They are making these to stay, and will continue to expand upon them.
We have no reason to assume they are lying after their record for the last few years has made major turns.
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Maybe you get a second choice, maybe our current choices get longer. Don't know, idk why you don't see how it can be an evergreen feature, it's pretty obvious. There is many ways they may do it. For now we just don't know which one they will.