I personally doubt it, it would have been nice to have 2 consoles sell over 100 mil in one gen, but it seems it will not happen, it is dropping off too fast, especially in the U.S, so I would say MAYBE 95 at most.

That number is more than 25M.

Yes, the PS3 can pass the 100M mark. It will be alive for many years to come.

It's possible if it continues to receive 3rd party support, and I mean more than just seeing Madden 2019 on the system in 2018.

It is dropping because it hasn't had a price cut in 2.5 years.

Price cuts won't do anything but stop the bleeding at this point - the big PS3 price cut was to $300. It will never get to $100. 

ps2 launched 5 years after the ps1, ps3 6 after the ps2 and the ps4 7 years after the ps3. It's not just about "no competition" between ps3 and ps4 it's about the lifespan of the console. Ps1 and Ps1 were undisputed market leaders of there generations in all reagions the ps3 doesnt have that. That means the sales after this gen started will be more split and retailers will wan't to move on to the next gen where they can make more on the new software.

Pricecuts alone won't keep ps3 sales up.

The only thing some could say is going for the ps3 that the ps1/2 didn't have is that if people want to play ps3 on a console it has to be on a ps3. The ps4 isn't backward compatible. Though if the playstation now works well that might not matter.

How many more years do you see the ps3 selling for? How many do you see it selling each of those years? Do you expect a reasonable decline year over year and lifespan? Or do you expect it to somehow hold on at a higher rate and for longer than is likely?

I see it selling for 6 to 7 years more. Sony usually follows a pattern of discontinuing a console a little before the sucessor of its sucessor launches and I believe we won't see a PS5 in less than 6 years. Besides that, PS3 has another advantage, the PS4 price point. Both PS1 and PS2 launched at US$ 300, while PS4 is at US$ 400. For late adopters, these difference wil be important. I'm counting on the rise of emergent markets too and that includes the opening of the Chinese videogame market. In these countries, retailers can't move to next gen. Put PS4s and Ones in your store and remove PS360 and you won't sell nothing with that price. Most of people predicting it won't sell nothing are from USA or EU, where it is cheap. In the rest of the world it isn't. It's expensive as hell and PS4 is even more.

Besides that, it wouldn't even have to equal PS1/2 performance. If it did, it would sell 115-120M. Assuming it won't do as good, 100M+ still is reasonable. If they price cut it this year, we can have 6-7M sales, maybe even 8M. The next year? 4-6M. That's 10M more in 2 years, so it already gets to 90M in the worst case scenario. Then it can even halve its average sales rate and do 10M in 4 years and we will be at 100M.

Markets/consumers decide how long a console stays on the market.  Sony was able to keep the PS and PS2 on the market long after the successor because the market still had a large demand for them.  The PS3 doesn't have the demand those 2 did.  And it won't sell for another 6-7 years.  The PS4 is too well priced and well received for PS3 to have demand for that many more years.

As for China, don't put any bets on it.  They are very mobile centric and the rules still applied toward consoles are incredibly restrictive.   Sony are better off trying to get the PS4 going there than the PS3.

Can it hit 100 million?  Maybe, but it's far from a sure thing. 

In most regions Playstation Now will be unusable for many years (internet infrastructure, data caps, service will not be offered in many countries).

And don't forget PS Plus... many PS4 owner will subscribe for multiplayer access and the monthly PS4 game. But they also get two PS3 games every month, so many of them without a PS3 will be tempted eventually to get an additional PS3 for these games.

PS4 well priced? I can buy one in Brazil for just US$ 2000. Other regions of South America may even have it for just US$ 1000. It is more expensive than an iPad (US$ 800) or a pretty high-end ultrabook with a Core i7 and dedicated GPU (US$ 1200).

In general, taxes are higher on consoles than in other devices because they aren't a basic need, so a lot of the price differences we see in the US can shift in these markets. PS2 had demand here until 2010. Do you think anyone in emerging markets bought it because they prefer it instead of a PS3? I bought my PS2 in 2009 and believe me, if I could get a PS3 instead I wouldn't even had thinked about it (fortunately, I got a PS3 2 years after it). 

Besides that, they will surelly come for these markets like crazy. Looking at Brazil during PS2 era, piracy was rampant and the economy was terrible. With PS3, there is almost zero piracy and now the economy is superb. These things are on shelves of all stores with piles of games. Sony is doing some heavy investments here, with the Ayrton Senna content in GT6, PS Plus and the cheaper exclusive games (launched at US$ 60 instead of the normal US$ 90). PS360 here costs around US$ 400. The magical number for emerging markets is on less than US$ 200.