110-130mil. Could be a bit lower or higher than the PS4. I don't see why it would drop more than a few million from the PS4 or grow much more than 15mil over the PS4.

I stand by 105 million or so, surpassing the Wii and PS1. PS5 has direct competition from the Xbox Series S/X which surely will have higher lifetime sales than the Xbox One. Then it has more indirect competition from the Switch, and in another few years or so the Switch's successor (Switch 2? Super Switch?) will be another form of indirect competition.
The PS4 benefitted from the failure of the Wii U and many blunders of the Xbox One. That's why even with the PS5 currently outpacing the PS4, I don't think it's quite enough. The direct and indirect competition is stiffer this time. Also, remember when many of us thought 125-130 million or more for the PS4 was a given? And now it will probably finish with 120 million or a little more. The same thing could happen with the PS5. It could reach around 100 million or less and then only sell 5 million or so units once the PS6 is out.

I'm optimistic it can do better than the PS4, but it's not going to be a big amount more or a big amount less, roughly the same. Let's say 115m-125m.

A tad more than PS4, i'd say 122 million.

Still the same.

Sony is more profit oriented these days.

I expect lower than the PS4, not sure how much though. Maybe 90-110m?

Too early so i will just say around 100M. 

Unless this generation grows a notable amount the PS5 should sell less than the PS4 due to significantly stronger competition this time. It wouldn't be that much less though since Sony isn't screwing up so out of those ranges I'll go with 100-110m.

No PS4 is not doing 120M. It is clear now that it will fall short.

120-130 million.
There is insane demand for it, it's following the proven formula of the PS4, and it will inherit the lion's share of the PS4's huge userbase plus a big portion of incoming new gamers who are growing up right now.