UnderwaterFunktown on 10 May 2023
It's hard to say since it was mostly Sony's decision to let it die off by not producing them anymore. Of course the supply chain crisis had some part to play in that but it think they also just wanted a quicker transition this time around and would rather have people buying their new system than the old one, especially since the new one could do anything a PS4 could do anyways (except fit in my TV cabinet).
The pandemic defintely also boosted PS4 sales for a while in 2020, so all in all I think realistically it would at most have done a few million more, ~120m maybe. However if Sony had just kept on producing them maybe it could have reached 125m.
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