Sadly, 'low noise' seems to be one of these factors that most(!) consumers consider 'nice to have' but don't really base their purchases around. Myself included.
Like, all other things equal, of course i'd go for the sleeker, smaller, quieter system - but there's so many other factors, like snappy UI, first party games lineup, etc. that will influence my purchase decision before we even get to the fan noise.
Like, sure, if God of War makes my PS4 Pro sound like a jet engine, that sucks, but i'm still playing God of War in a 'close to 4k' resolution... something no other console than the PS4Pro has to offer.
I certainly hope Sony will manage to make a console that performs well but doesn't sound like a jet engine. But when Holiday 2020 hits I'll simply purchase the console with the better launch lineup / more attractive games slated for 2021, simple as that.
I'd love to go with two (3, if you include the Switch) consoles for multi-plats next gen. But Microsoft isn't making it easy for me with the Series X' bulky design ...
But Microsoft certainly raised the bar showing what's doable with the One X. Making the most powerful console that is also smaller than the Pro and more quiet. So Sony really doesn't have an excuse anymore.