Well, it seems quite inevitable that Switch will outsell PS4 (which seems to stop at about 120M). But PS2 is a tall hurdle to clear. So not sure.
Currently I would put the chance of Switch outselling PS2 at about 30%. That is a realistical chance, not too unlikely. Remember, that is about the chance 358 gave Trump to win against Clinton in 2016 (2020 against Biden they put that chance more at 10%).
There are some major junctions, that may influence this probability and that totally depends on Nintendo and their plans. These are: new model, price cut, Wii sports like game (or even evolution like Ring Fit Adventure over Wii Fit) and the release of the next console and how fast Nintendo will drop Switch support in favor of the next console. If these things happen in favor of Switch it could well be selling past PS2, if they happen unfavorable the Switch sales could stop just above 120M.







