If Nintendo fans want 3rd parties to flood the console, then here is what Fans of Nintendo need to do, they need to STOP BUYING NINTENDO GAMES!!!
If Nintendo see it's financials crash cuz they are making almost no money on their games, they will be forced to work with 3rd parties and forcing them to remove their tight policies in a bid to build better relations with 3rd party developers.
We have a good example this gen, Sony was humbled with the PS3 after everything they did, they worked hard to make programming for the cell as easy as possible for developers, they developed the phyre engine that 3rd parties could use to make their lives easier, they even had a special teams that went from developer to developer helping them, teaching them, how to code correctly to extract performance. In essence Sony tried it's best to accommodate developers and to their success in fostering good 3rd party relations Sony got Valve to put thier games on the PS3 after the head hincho Gabe Newell publically pointed out his negative opinions about the PS3. Now with the PS4 we have Sony continuing this mind set with developers to the point where no 3rd party developer thus far had made any bad or negative comment about the PS4.
Nintendo should take a page from Sony's book and try foster relations with 3rd parties, and it seems that the only way to force them to do this, is for the Nintendo fans to use their wallets to make Nintendo wake up. I know this will be hard for the Nintendo fans as it's something that will rub them the wrong way, but it's either fans do something or simply shut up, put up with Nintendo's direction and leave it at that.
The other crazy solution is to simply not purchase any more hard or software form Nintendo, allow them to follow sega, and then enjoy Nintendo games on the PS5 and the xbox 4 when Nintendo finnally jonis the likes of EA, Sega, and Activision-blizzaed.