Isn't this ideological though? The economy can definitely survive without growth, if we change from the idea that a human's existence needs to be justified by labor and move away from a capitalist mode of organization.
If your first thought is "gross, commies!" doesn't that just demonstrate that the issue is indeed ideological?
Of course if you're a gross commie I'm sure you'd agree since AI, like any other mean of production, will remain first and foremost a tool in the hands of the dominant class, and while using AI for emancipation is possible, it won't happen naturally through the free market.
Maybe GDP will suffer but we've always known that was a mediocre metric at best. We already have doubts about the real value of intellectual property outside of artificial scarcity, which we maintain only because we still trade intellectual work for material goods which used to be scarce. That's only a fraction of the world economy already and it can very different in the future.
I have no idea what it'll be like when most people are free to do creative work when the average person doesn't produce anything anybody might want. But if they're happy I'm happy.