We thought that consciousness was the core of what made something worthy of moral consideration, because only life showed conscious behavior. Now we have machines that can output behavior indistinguishable from consciousness.

I think that reevaluating how to determine if something is conscious is the wrong reaction to this. It should be to reevaluate if consciousness is really the right thing to care about.

Maybe the new consideration should simply be to preserve (biological) life. Or maybe to preserve complexity that can't be easily reproduced. So we should care for humans, the planet, our society, but not for the state of some gpu's VRAM.