Really early to predict, but I'll bite.

105 million. It will barely surpass the PS1. I think the Switch and PS5 will be the last consoles in history to reach 100 million or more. The hardware market is more or less stabilizing and it will shrink.
Even building off of Switch momentum, Switch 2 probably won't hit 100 million. 90-97 million is more like it. Possibly way less than that.

Voted 120 - 129

I believe PSVR2 will see a quite substantial increase in sales. PS5 will have the power to deliver full gaming experiences in VR, and with WiFi 6 and Bluetooth 5.1 it has the hardware to make the experience wireless, simple, and reliable.

The PS4 had it pretty easy competition wise this past gen as both of it's competitors fumbled out of the gate.  Nintendo is in a very good position with the Switch right now, and Microsoft is not actively shooting themselves in the foot with the XBox Series X release the way they had been with the XBox One.  So, I don't see where that huge increase in sales for the PS5 would come from.  Personally, I said 100-109 million.  I don't doubt the PS5 as a potential 100 million seller, but I don't expect it will upend it's predecessor in lifetime sales either.

It’s too early to tell, but I guess 90-99 million units given that the competition is stronger this time and both Sony and Microsoft give more incentives to people to shift towards PC. As for a PSVR2, it will sell better than the first, or at least will have a better launch month than the first.

In another thread I guessed 105 million, so I'll keep it there.

80-90 milllion, i think xbox will put up a better fight this time

Worse than PS4. MS nor Nintendo fucked up. In fact, Nintendo is doing the best they have since Wii/DS. MS loaded their studios. Sony doesn't have that one thing to mock and take advantage of. It's Sony so it will do well but may reach 90 or so million but not 100. Stiffer competition this coming generation.

PS5: Depends on if and how much PC, Xbox, and streaming eat into their market share. Gonna go with 100-110M for now.

PSVR2: Depends on how much they can lower the barrier to entry, price and wireless being the biggest factors. I think we'll see gradual growth.

I guess XBOX and PS5 will move 140-150 million combined or less

So 90-100 million for PS5

I am not sure we can compare with past sells. First, PS5 and the new xbox will be limited by the production capacity for at least the first year (because of some components that are difficults to have like memory RAM for example). Second, do we really see a big graphical difference between PS4 and PS5 ? Third, for the moment 99% of all new games will be released on previous generation, so why buy a new console ? So it will have a slow start I guess...
I can be wrong...