If it is $300 and has a mainline Pokemon game I see 30m-40m easily. If it gets third party support as good as the PS4 and Xbox One I believe it could sell 50m+. Right now Sony has such a strong foothold (and even Microsoft has turned things around) that I don't see it selling 100m+.
Worst case scenario I see is sales in the 10m-20m range. That is if the price is $400 or more with poor third party support past launch and no mainline Pokemon games.
I could be completely wrong though.
VGChartz Sales Analyst and Writer - William D'Angelo - I stream on Twitch and have my own Youtube. Follow me on Twitter @TrunksWD.
Writer of the Gap Charts | Weekly Hardware Breakdown | Top 10 | Weekly Sales Analysis | Marketshare Features, as well as daily news on the Video Game Industry.