Thanks maxmixiv; I was thinking that because 'об этом я никогда не хочу снова услышать!' is all about someone NOT doing something (ie no action), that would be expressed as imperfective. Also, as you said. it's about someone hopefully continually not doing something.
So would 'об этом я не хочу снова услышать завтра!' be correct? Or should this sentence use слышать as it's talking about a thing that won't happen (ie 'no action') ?