I put about 10-12.5 million though I'd say this is on the low end. My reason is that I don't see PS5 doing as well as PS4. There isn't as much enthusiasm for next gen as there was last time. I think right now scalpers are fudging interest by taking up a lot of the supply. I also expect 2021 will be a very bad economy. The COVID economy has been covered up by the media but for most of the year a third of renters could make their payments and same for home owners. As I understand it, the restrictions will lift. PS5 is going to be too expensive especially with $70 games. I think consumers are going to stick with the last gen longer. Switch also poses a nice alternative with a $200 smaller price tag. Also, Sony has burned through a lot of its goodwill in the last few years. There isn't any killer app on the horizon to boost sales either. So my prediction is a bit lower than most expect but I'm not seeing the PS5 meeting the first year of the PS4.
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Known as Smashchu in a former life