Back in sepctember -

"Masanao Maeda, a corporate director at Sega's gaming unit, forecast that the title will sell 4 million units, although he didn’t specify a timeframe for achieving the milestone."

http://www.next-gen.biz/index.php?option=com_content&task=view&id=7234&Itemid=2

 As of now M&S has sold about 2.5 million WW and is shifting another 100-125K/week. 4 million is very much possible and it might overhaul that target once the Olympics Festivities gets into high gear.

 I sorely miss the online/Wi-Fi play option from the Wii version Totally inexcusible on Sega's part.

With the DS version to be released soon, the franchise could hit 8-10 million combined sales. 

What will be next in the Mario and Sonic franchise, perhaps football?

Don't forget Sega later said they meant 4 million for the Wii AND DS versions.

They're halfway there with one version already. And they can do a "relaunch" in time for the Olympics to boost sales again.

They'll hit 4 mil easy.

I think the important question to ask is 8-10 million a bigger number than 4 million.  If the answer is yes; then, Sega will reach their claim of 4 million.

I think the way sales have took off it's very possible we'll get a revamped and relaunched version right before the olympics.

They've probably left out several events and online play so they can do just that.

Obviously SEGA will beat their expectations.

I doubt there will be many Mario and Sonic games, though. With the way Mario spin-offs sell, they don't need to have Sonic in them. Hopefully we'll just see a Winter Olympics game in two years (SEGA should be able to keep the liscense due to the sales of M&S), and maybe a Mario vs. Sonic platformer of some sort.

yes SEGA has a huge shot at making it to 4 million,with the wii version alone

Considering the Olympics is this a ways off, and that'll boost sales further, 4m is definately in the bag on the Wii version alone.

yes... with the Wii version alone. It will sell solid all year (about 50-70k WW a week) and be around 3.5 million going into next christmas(with an olympics boost figured in) This title appears to be a BIG CMas seller so it should crack 4 mil by the end of Next holidays. It will sell 2.5 million LTD in other alone.

^50k a week would mean it will sell 2.5 million this year,not 1 million