Well, on one side i can understand the game developers and publishers. They invested most of their money and knowledge in x360 and PS3, and out of nowhere came this white box with remote which started outselling the fancy blueray player and portable heater. Only few publishers supported the white box, and that faith returned them very positive financial reports for that part of the year.
After starting shock, devs and publishers have calmed down, reassuring themselves that the white box will die in the next few months, so they ignorantly continued to put their effort into competition. And of course make sure to subtly (or not so subtly) put down the white box in every intreview.
But, lots of time has passed, and the white box still floats above other two. While some devs and publishers have accepted the situation and switched to white box, or atleast port their ps2 titles on it, the others still believe in it's downfall, and are more and more pissed every day because the thing just refuses to die.
It's a bit late to start learning coding and adjusting for the new machine. And that is amplified with the fact that nobody really knows what will happen with it in 2 years(it wasn't supposed to live at all). So, they ultimately get the idea that they might put some showelware on it, but it would require lots advertsiment to sell.
So, why wouldn't Nintendo spend their money and advertize these titles instead of 3rd parties? Afterall, 3rd parties are doing them a big favour by putting showelware and B-grade ports on the white box. White box defies the laws of logic. You put crap in and get money out. Machine from heaven. The thing that will fund their future projects. The only problem is: why does it rejects to work lately?
.
