Well the title says it all. I predict that The Last of us Part 2 will sell 5 million units or more, within its first week (or even less). This would be Sony's biggest launch on PS4 (and maybe ever)
For reference here are Sony's biggest released so far on PS4
God of War with 3.1 million in 3 days
Uncharted 4 with 2.7 million in one week
Horizon with 2.6 million in 2 weeks
Infamous with 1 million in 9 days
Bloodborne with 1 million in 12 days
Detroit with 1 million in 2 weeks
To put things into perspective, Im predicting that TLoU2 will sell almost DOUBLE what UC4 sold in its first week, and people thought that UC4s number were monstrous (Well they are).
So bring it on Naughty Dog!