3rd party games haven't sold at all, so no one wants to develop for it other than Nintendo.
No.
Please don't believe whatever ignorant person told you this. It hasn't been true since the Wii became the most desired console on the market. This past month the only 3rd party multiplatform game in the top 10 was Lego Indiana Jones and it sold the most on Wii, over DS and PS2, the "next-gen" console versions didn't even make the top 20. Also regarding Mario Kart, it's sales are much stronger than the previous two iterations for the GameCube and DS in the same time period (already half of Double Dash's LTD total). It's the 4th highest selling game this year as of June, last I checked, directly behind Guitar Hero III which, shock, has sold the most on Wii than all other platforms, sidenote: as did the Aerosmith version.
3rd party games ARE selling, but people have to understand that the ratio of GOOOOOD 3rd party games on Wii in comparison to the other 2 is so out of whack that it's obvious why there is a discrepancy in sales. 360/PS3 get real sequels to series like Soul Calibur IV that was just released, while Wii get's Soul Calibur: Legends, which sucks. These lazy developers only care about money, so they make crappy stuff that will sell enough for them to turn a profit, and they don't have to put any effort into it, thus they have more time to polish the actual worthwhile stuff for everyone else that I'd bet my life would sell most on Wii with it's 10million+ sales lead if given the chance.
If the disgruntled developers actually put effort into a big name franchise and release it for Wii, it will sell. Instead, they would rather make a quick buck with crappy mini game collections and 2nd rate remakes of older games instead of rewarding good sales with high profile titles the 360/PS3 end up getting. (Capcom, I'm looking at you
) Nintendo just needs to stick it out with their usual great 1st party stuff, until the rest of the industry stops believing games won't sell on their system.
Just to add, don't use Nintendo's E3 as any indication what direction they are going in 2009. They have already showed 1)they don't use E3 any longer as a big deal since it's downsizing to a simple "media briefing" & 2)they don't show games that aren't already far along in development and worthy of being seen which means that new Zelda/Mario/Metroid/Smash Bros/etc aren't complete enough to give a taste to gamers, which shouldnt be surprising at all considering all four franchises have released new installments within the 1st year and 3/4 of Wii's life. It's not like Madden.