I thought alot about it, too. My bet is 132m.
I suspect the PS5 to have longer legs in terms of 'quality software' output than PS4 did. I suspect the raw leap in hardware power to be the reason for longer support of critical acclaimed games, SSD-written engines being the motor for that.
I suspect PSVR2 will also have a bigger impact on hardware sales than PSVR1 did.
I really suspect the PS5 being able to climb behind 125m, summitting at +-130m.