I think some people may be getting a bit (a bit) carried away due to the latest numbers. Yes the game has almost unprecedented sales, and yes I expect it will have absolutely great legs for a long time to come, but I believe at least some of the numbers we see here are further augmented due to the season (hence why week 3 is higher than week 2), and so while I expect it to do great, I think the higher end of expectations (30 mil) is a bit too optimistic, a result of people looking at (partly) season influenced numbers and extrapolating them.
But who knows.
Currently Playing: Shin Megami Tensei: Devil Survivor Overclocked, Professor Layton and the Curious Village
Anticipating: Xenoblade, The Last Story, Mario Kart 7, Rayman Origins, Zelda SS, Crush3D, Tales of the Abyss 3DS, MGS:Snake Eater 3DS, RE:Revelations, Time Travellers, Professor Layton vs. Ace Attorney, Luigi's Mansion 2, MH TriG, DQ Monsters, Heroes of Ruin