Uh... I disagree, there are definitely a lot of large projects coming to the Wii.
The only developers Microsoft and Sony can "tell" what to do are their own first- and second-party teams. Third-parties can, unless they are bound by contract, develop for whomever they choose.
EDIT: In addition, Nintendo has the most solid first-party development of the three console companies right now. They've survived on less third-party support than they have right now.
Also, the Wii is fast approaching having a larger userbase than the 360 and PS3 combined, so that issue really isn't a factor in this anymore.
Finally, the cost of production for any PS3/360 multiplatform game will always be more expensive than a Wii game. Even with a sales boost, the development costs for either system would still outweigh profit from sales. Taking the time and manpower to code the game for both systems makes it even harder to pull profit.
PS3: 5.51m/51w, avg 108,039/w (up 239)
360: 12.93m/102w, avg 126,764/w (up 625), leads PS3 by 7.42m (up 70k), avg lead 18,725/w (up 386)
Wii: 13.52m/51w, avg 265,098/w (dn 1,102), leads PS3 by 8.01m (up 90k), avg lead 157,059/w (dn 1,341)
If 360 sales stabilize, PS3 sales increases needed to pass 360 by...
01/08: (008w) +875.8%, 04/08: (021w) +344.4%, 07/08: (034w) +219.3%, 10/08: (047w) +163.5%
01/09: (060w) +131.8%, 04/09: (073w) +111.4%, 07/09: (085w) +098.1%, 10/09: (099w) +086.7%
If Wii sales stabilize, PS3 sales increases needed to pass Wii by...
01/08: (008w) +1072.%, 04/08: (021w) +498.4%, 07/08: (034w) +363.4%, 10/08: (047w) +303.1%
01/09: (060w) +269.0%, 04/09: (073w) +246.9%, 07/09: (085w) +232.6%, 10/09: (099w) +220.3%
If PS2 sales freeze, Wii sales increases needed to pass PS2 (as of Mar07, 108.4m) by...
2008: (008w) +4373.8%, 2009: (060w) +0496.5%, 2010: (112w) +0219.6%, 2011: (165w) +0116.9%
2012: (217w) +0064.9%, 2013: (269w) +0033.1%, 2014: (321w) +0011.5%, 2015: (376w) -0004.8%
At +0% it will pass it in 358w, the week ending September 19th, 2014, at an age of 409w (7y44w).
Current age of PS2: 7y37w.
Last update: Week ending November 3, 2007
