As for App devs, native development for Bada is a massive headache that bears no comparison to WP, iOS or even android. From SDK bugs to Store bugs. And even when using web technologies (phonegap or pure web app), their webkit based browser isn't up to Safari/Chrome standards. Plus the low end devices have (had?) slow processors which make a lot of the fancier CSS stuff unusable.
On top of that, how many people will even know and use the bada app store?
Oh and nowhere in that mini-article is it mentioned that Bada will probably-maybe be replaced by another OS, Tizen.