According to a NeoGAF post from a Visceral Games employee- "It is a shame that no one bought this (Dead Space Extraction). As much as everyone made fun of Frank Gibeau's 'experiment', it will actually influence the SKU plan with respect to the Wii". So I guess we'll be seeing less games like DSE on the Wii from here on out, but is that a bad thing?
Dead Space Extraction is a good game with a few fantastic moments, but it's missing a lot of stuff that has proven to sell "M" rated games, on the Wii or otherwise. For example, Resident Evil: Umbrella Chronicles (which sold over a million copies) had a lot more content than DSE, despite being in the same genre. Likewise, DSE lacks the creative magnificence of No More Heroes (which sold well enough to get an awesome looking sequel), as well as the name recognition of the Call of Duty games (two of which sold over a mil on the Wii) and Star Wars: The Force Unleashed (which also is a Wii million seller).
So I say to EA, you're right, don't make more games like DSE. If you want people to buy a $50 game in this highly competitive market, make sure it's a creative masterpiece, over 12 hours long, and/or carries a big name brand. No more of this "Our market research has shown that on-rails games are Wii friendly!" crap. Resident Evil: Umbrella Chronicles has proven to be the exception, not the rule, when it comes to sales in that genre.