It'll definitely push some significant hardware but this late into a console lifetime, I'd argue that most of the userbase for this game is either :

1) Already bought a new Gen console and has prepared for it.

2) Are on PC and won't be willing to purchase a console for the eventual port a year or so later. 

The narrative of pushing GTA VI as the console savior of this generation has always been quite iffy if you keep data comparison with the previous game in mind.

It'll do incredible software sales most likely, but the further it gets pushed away (dixit 2026 launch most likely), the likelier people will just have bought into the console ecosystem already which won't result in the hardware boost people have been clamoring for. 

The difference is GTA5 launched at the end of the generation compared to GTA6 launching right in the middle of this one. Take a look at something like College Football which ended up giving a boost to both the PS5 and Series X this year. 

It is a "next gen/current gen" exclusive which is important. GTAV already gave PS3/Xbox360 a much necessary injection  near the beginning of their lives, along with dozens of industry shaping titles like COD4.

If all you do is play Fifa, COD, Fortnight etc you technically haven't missed out on your favourite franchises by sticking to last gen consoles so far this gen. Even Sonys biggest exclusives have been on PS4 (GT/Horiszon/GOWR). COD/Assassins Creed/GTA all being next gen exclusives next year will be quite impactful in getting some casuals to upgrade. 

I wouldn't even say the Pro is a big blunder. Its just enthusiast forums are a bubble that can run wild with narratives lol. 

Take the profit margins for instance. It was a huge point of discussion last year but its not even being discussed much now when Sony doubled their margins. Or how the mention of live service games gets PlayStation fans into a frenzy. I feel like many believed this generation was supposed to be more competitive, that Sony is going to be tripping over themselves, that they'll abandon single player games for the live service gold mine, and that notion hasn't really left these enthusiast boards. Essentially, Sony is doomed, because my confirmation bias says so! 

That's a hot debate on this site and some others.

I saw someone say on this site before that comparing Switch to Xbox and PlayStation is like comparing motorcycles to cars. 

And I think PS5 will sell extremely well. PS6 is 3-4 years out which is a ton of time for PS5 to sell more before it's replaced.

If Xbox 5 beats PS6 to the market by a year or two (very likely) it will eat at some of PS5's NA sales figures but not much in Europe and a nonfactor pretty much in the rest of the world. The only region where Xbox has consistently done well is NA (mainly the USA). Xbox is a more or less a non-factor in Japan, especially during the Xbox and Xbox One days. 

Definitely not just into a hardcore gamer bubble, it was literally everywhere in the internet, the Pro reveal became an actual widespread joke like the PS3 back then.

Reception now has actually being quite decent or even good, basically everyone reviewing the Pro is satysfied or happy with it, but the comment on their reviews are still mostly people ignoring that and either being angry or joking about it.

GTAV prevented the Xbox 360/ PS3 to be more down YoY than they already where. I am following this side since 2005.🙂

All 3 are gaming systems and can be compared and they will be compared. All 3 play physical games or have at least 1 SKU that does. This whole nonsense started when Sony was not Nr. 1 anymore (Wii). Look for example at sports. 2004 Greece won 1:0 against Portugal and they became european champions. They where clearly the underdogs and most people cheered for Portugal and Italy. Did anybody came and said: You cannot compare Greece to te Rest because they play for a different audience or it was just luck?! Greece won, full Stop. Portugal had Luis Figo, Christiano Ronaldo, Pepe... Greece had a bunch of no name players. When a  relativley unknown polish soccer player from germany (Miroslav Klose 16) surpassed Ronaldo (15) in World Championship goals, nobody claimed that you cannot compare both just because the latter is more famous. All 3 systems compete directly with each other. Who sells more wins, who sells less looses. It was always like that and it will always be. Only because people cannot accept their favourite system loosing, does not make the winning one a "non competitior". Thats what people need to learn.

A little off topic but ..

We Finally Know How Many PS3s Were Ever Made

The total number seems to be 88,159,116 .. Now someone can make those PS2 calculations right there

Probably not true. PS3 shipments ended in May 2017 for Japan.

Other countries were March 2016, and October 2016.

June 2016 is not consistent with any source and isn't even a 10 year life cycle.

Sony's source themselves says

https://sonyinteractive.com/en/our-company/business-data-sales/

"More than 87.4 million
(As of March 31, 2017)"

So definitely not June 2016.