I get what Kytim's saying.
The short answer as to why the 3DS is going to get better third party support is that third parties seemed to have arbitrarily decided to make strong games for the 3DS before it's released. They're ditching the usual "wait and see" crap like they did with the DS and Wii and making sure they have competitive product in the stores on or near day one. The long answer involves two primary reasons including the long term health of the various third parties and Nintendo's current financial status.
One reason for this is that, while much hay can be made from the usual whine that only Nintendo games can be sold on Nintendo systems, it doesn't take a genius to figure that's usually because Nintendo makes the better games on said systems. While this can be useful when you need to write off a system (Nintendo or otherwise) that isn't performing very well, when you ignore a bonafide hit that ends up being the best selling game system of all time because of a preconception, you look like a fool to both gamers and your finance department. Considering the 3DS is the next system after the best selling system of all time, it's pretty much guaranteed to get a healthy userbase right out of the gate, especially considering their closest competition from Sony seems sluggish to respond or reluctant to participate, and the next competition from Apple seems rather unexciting at this juncture (despite Matt Cassamassina's input.) One of the things that crippled third parties on the Wii and on the DS initially was the fact that they did not make very good games consistently and mostly tried to cash in on what they perceived as a "casual wave" as evidenced in the "Third Party Wall of Shame" thread here:
http://www.nintendoworldreport.com/forums/index.php?topic=30478.0This gave them pretty bad reputations, as the Wii itself is definitely not an unprofitable platform (just ask Nintendo,) but it can be a prohibitive environment when all 75 million Wii owners think developers that are not Nintendo make junk, and rightly so. Conversely, if a similar wall were created with the third parties' current 3DS offerings, and consumers were to see this on the shelf accompanied by other high quality titles, then third parties have a decisively better chance to be more relevant to a large userbase.
The second reason for the third party boom is that Nintendo's got a lot more money this time around and is in a better position to give "incentives" for third parties to make games on their handhelds as opposed to their competition, as Sony's game division (and Sony itself) is in dire straits through repeated losses and thus is less inclined to offer incentives, Microsoft seems uninterested in the handheld space at this time, and Apple seems to be unable to turn touchscreen-only micro-transaction games for cellphones and Tablet Macs into real market movement.