As for someone changing their mind at the very last minute, Nitschke said: “Once you press that button, there’s no way of going back.”

Regardless of what your philosophical beliefs are this seems like a gigantic problem to me. You should be able to stop the process at any point before you are unconscious. Imagine having second thoughts in that thing after you hit the button. You just know you’re fucked, that you are going to die, and there’s nothing you can do to stop it. Sounds fucking terrifying.