I wonder if this quenching is just a temporary delay, and once whatever energy source that prevents hot gas from cooling and collapsing runs out, another wave of star formation happens, 10, 20 or more gigayears into the future.
Heck of a good question. On the one hand, you'd expect that anything that can intersect with the black hole would eventually do so until it all ran out and the black hole quieted down, unless low-angular-momentum ellipticals are so chaotic that more just keeps raining down. On the other hand, these black holes only grow and aren't getting any smaller (on the timescales that matter (seriously it would take so long for a supermassive black hole to evaporate that the relevant question is 'is matter infinitely stable or only nearly infinitely stable')).
I do ...
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