The game is at pretty much 4 million with physical sales. How much do you think it can sell, including digital sales?

My answer: Between 6 and 8 million.

If the free digital games with Mario Kart 8 count during the promotion, I'd say at least 6 million, if it stays bundled, maybe more.

I would say it counts. The people are still choosing that game over another one, so the game isn't being shoved down your throat.

Around 8 million. It still has some life left in it.

If they keep bundling it, it should manage 7-8 million. Probably right up near the top for the entire Wii U's library in lifetime sales. MK8 can beat it, don't see much else that can.

6.5 million

5 million lifetime.

Around 50% attach rate (digital + physical), it's at around 65% at the moment and it was at around 55% before it was bundled.
Depends on what you think the Wii U will sell.

I don't see how you could think that. Wii U has another 2 1/2 to 3 1/2 years of life. It could easily sell another 1 million more copies in that timeframe.

Didn't the game sell around 3.5mil before bundling, wats your excuse now?