What do you think?

PS2 have sold around +23,000,000 unit, and 3DS is at +18,000,000 by end of 2014.

I think that will happen!

2015: 2,500,000 (20.5m)
2016: 1,700,000 (22.2m)
2017: 800,000 (23m) (4DS released)
Other 300,000/400,000 in 2018/2019

Discuss!

Yeah I think this is very likely.

Another 5M? It is possible and not very hard. I can see it happening.

The DSi line brought in half of the previous DS sales in Japan, so very possible.

In Japan, maybe. It depends on what other games Nintendo can put out, and how soon we'll be looking at a 3DS successor. I can definitely see it happening though.

When I first saw the title, I didn't notice the "in Japan" part. I feel like that would be impossible lol

It's possible and I think it can..

Of course the PS2 sales in Europe and US are too much for all console (withouth DS). xD

Look at it like this, the 3ds is currently at 18.42mil lifetime. This year (5th year) its at 590k given strong 1st quarter with the n3ds help.

Ok now lets look at it at the absolute worst case scenario for it.
~No N3DS Exclusive
~No Major Games left (lets say no YW3/Pokemon XY2/etc)
~2016 3DS successor comes out Q1.

I say it'll be
2015: 1.6mil
2016: 500k
2017: 200k

Minimum lifetime= 20.2mil+

Now a more realistic look, with some good support and a Q4 2016 successor release...

2015: 2.3mil
2016: 1.2mil
2017: 500k
2018: 150k

About 21.7mil

I dunno know, it might be a bit less imo. It has a chance but i think its safe to say 3DS atm will be between 21mil-22mil lifetime

There is a error in this numbers.

18,000,000 by end of 2014 + 2,300,000 = 20,300,000 + other 1,200,000 = 21,500,000 + other 500,000 = 22,000,000 + other 150,000 = 22,150,000.

How you have 21,700,000?

Yes of course