10 mil is 2 mil more than the current best so that would be a huge undertaking. I do believe it will maybe eventually reach 9 mil but 10 mil is too much
I think you are vastly underestimating AC here. Remember, that current 5 million number is only on physical copies sold, so it is likely already at 7 million. Which means by end of this year alone it could be close to 9 million. 10 million should be passed next year. Lifetime 12 million is certainly possible.