When you think about it, Switch may already be above the PS2 by sometime next year, when it's at ~158M but we won't know, and in reality Switch may be #1 while at the same time, everyone thinks it's still #2 because the number is 160M, while in reality the true sold to consumers units may for example be 158.3M of the PS2, and Switch may hit 158.5M sometime next year.

Think positively! When Sony stopped counting PS2 numbers they were down to 600k shipped. They never announced a number lower than that, but they still had a whole nother fiscal year of sales. Nintendo already announced 550k shipped for the Switch. So they should at least have another FY of sales. The most funny thing for Nintendo to do at this point would be to combine Switch and Switch 2 numbers and then claim 161m for Switch.

Either way if Sony lied about PS2 numbers, then they also lied about PS3 numbers, and they lied to investors about the PS3 being down YoY. Now that would make the news!

Imagine the Switch 2's sales going down so hard (due to the price hike) that Nintendo pulls out a Sony and does exactly that, combining SW1's and SW2's sales numbers to deceive the investors.

Funny to picture this, although the likelihood of it happening being minimal. They were crystal clear when it came to the Wii U's sales, so they wouldn't do this now

I will put here two quotes, from one very old thread about the PS2. According to that PS2 should've shipped around 1M units for the first quarter of FY 2013, and also there is that guy that says the forecast is 3M until March 2013, which would put PS2 at 158.1M. Of course it's possible to be surpassed in the end, but this was the forecast according to him. I couldn't find official info on the web however .. 

A few notes:

1. There are variables whose impacts we don't know yet (India/Indonesia release, the cutting of official supplies to Europe)
2. We really only have a single year over year quarter since the Switch 2 released, and even that isn't a full post-Switch 2 release quarter.

But, right now, the year over year quarterly decline is about 0.68, which if calculated for quarterly declines predict Switch passing 160 million in autumn next year, and will go on to sell ~163 million by 2031 (5 years from now).

But the picture will become clearer by February or May 2027 for how much the Switch will ultimately sell (as that will include a quarter and change of Oceanian/South Asian sales... They might be negligible, they might be a few million. This is applying a decay constant of 0.68... (whatever Q2-2026/Q2-2025 works out to). So, a very narrow data set to predict the future. A full second year of Switch 2 would be better.