I am curious on how you think Uncharted 4 will sell 3 million more on the PS4... With an install base of only 15-20 million compared to 80+ million. Uncharted 2 and 3 both sound just barely 6 million copies.. and there was no growth between 2 and 3.. in fact it sold a little less copies..
I agree with your HALO 5 figure.. Halo 3 sold 11+ and Halo 4 sold about 9 mil. While the X1 console base will only be around 15m on release and maybe hit 20 m during Halo 5 lifespan could see a 8m in sales (as it would be a decline from previous outings)...
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Predictions on 12/01/15 - Generation 8 Totals: