So one month of data is enough to predict the rest of the year and the year beyond? But using the whole sales curve would be bad right?
I really want to see this scenario where this year PS4 sells only 6M.
Now this is just priceless. For starters, math would do wonders for you since we have two months of data (not 1) for 2020 and a 45% decline would result in a little under 8m (not 6) for the year. Are you seriously complaining about me using 2020 numbers to predict 2020 numbers? What else do you expect me to use? 2014 numbers? 2015? History says the decline will not stop until discontinuation, so YES, I can use recent numbers to make estimations for this year and beyond. And the hell are you talking about sales curve? It's declining, no mistery here.
Instead of downplaying my predictions because you dislike the numbers in them, why don't you show your own predictions and argument why you think they will come true?