https://mobile.twitter.com/ZhugeEX/status/857850697135554561

I had been under the impression that Ps2 was ahead, launch aligned. Guess that's not the case. Credit to the one and only, ZHugeEX

The PS2 had legs that he PS4 simply won't have. It'll fall off eventually.

Im really curious as to how many units it will sell by the end, but at least now im almost 100% sure its gonna get to those 100 millon.

Pretty much everyone thought it would've already fallen off by now. This gen can get interesting yet. 

100M is all but garunteed 

I demand horizontal lines in that graph.

I hope that the PS4 at least matches the PS2 in sales. It beating the PS2 sales would be the icing on the cake with a cherry on it too.

Yeah, That's never going to happen. That would make March 2018 the halfway point of the PS4's sales, the ps5 will be here by November 2020. We're looking at a range of about 105-120m imo. My current guesses would be something like this:

If PS5 Releases  Holiday 2020

March 2018 - 78 Million Shipped

March 2019 - 92 Million Shipped

March 2020 - 104 Million Shipped

March 2021 - 112 Million Shipped.

March 2022 - 117 Million Shipped.

If PS5 Releases Holiday 2019

March 2018 - 78 Million Shipped

March 2019 - 92 Million Shipped

March 2020 - 100 Million Shipped

March 2021 - 105 Million Shipped.

Hey now, don't be shooting holes through my dreams, damn it. In all seriousiness, it depends on how long (and strongly) Sony supports the PS4 after the PS5 launches. 

Yeah, IMO 120 million is in the bag by now. Even if it misses the target it will be by an insignificant margin. I am expecting overall revenue that it will generate to be above the PS2. Absolutely stellar performance for the PS4.

Yepp, and it should not fall behind. With mostly standard tech, the move to digital, the revenue from PS, and yearly revisions to hardware (Some at an internal level only), PS4 should reach price levels we have not seen since PS2 also.

Some things that I see happening to keep PS4 ahead of PS2

-I fully expect PS4 to $249.99 by this holiday with deals that go below $199.99.
-I also believe Sony will continue to shick the PS4 APU at every possible die shrink going forward, so we could see PS4 and PS4 Pro on 10nm, 7nm, and 3nm before production is ended.
-There will very likely be a Digital Only PS4, and yes a PS4 Premium.
-Due to the above I expect a $199.99 base price in holiday 2018, and a $149.99 base price in holiday 2019, with a $99.99 digital only edition.
-PS4 will continue to be supported well after the PS5 launches, whether that be in 2019 or 2024.
-PS4 is Sonys door into the OS and Ecosystem battle, so it will be pushed like no other PlayStation in history, as the entire future of the company rides on its ability to get as many people as possible into the Sony ecosystem.
-Eventually all Sony devices will be built from the same DNA, thus making every sony product a PlayStation eventually.