1) Everyone assumed the Wii would fail; diverted resources and put all their chips into the "HD" game. As a result, Wii got little support initially.
2)Wii took off and 3rd parties got caught with their pants down. However, they didn't know much about Gamecube architecture, much of which the Wii is based on. With this little knowledge, and the assumption that only Wii Sports-like game sell millions, they attempted to cash-in on the missed Wii boat with quickly made knockoffs, that had nowhere near the same quality or polish as Nintendo's originals.
3) Without knowing what exactly their market is, 3rd Parties keep throwing things at the Wii wall, hoping something sticks, but they don't realize that quality games that cater to an audience's need and a shred of promotion is what sells games, rather than unpolished me-too titles. Discouraged by their failures, the assumed pressure from curious shareholders/investors, and the continued success of the Wii (2008 was...legendary saleswise) they begin to reject the console, and begin cratfing literally a hundred reasons as to why they should abandon the Wii boat, and continue the HD course. It began with thinly veiled cheap shots at first, but then the gaming media assisted in turning it into an all-out war. ****It got to a point where games were likely made with the intent to destroy the Wii market, which was nearly accomplished.**** 3rd parties would release dozens of absolutely terrible titles, some that reused the same unpolished assets and thrown into the retail chains.
4) When it got into the overall mindset that the Wii was not worth the consumer's time, the few game companies that were even trying to support the Wii had their products mudslinged. The main proof of this was the "Core games don't sell on Wii mantra". For example, THQ's experimental failure, Deadly Creatures, supposedly was the end-all,be-all of their core support. After that destined failure only sold 150k, other 3rd parties of already shakeable quality were called into question, and the idea that Wii games were not worth it was officially the immediate response to mostly all of its software. Although it is weaker in terms of hardware, developers went out of their way to produce PSP titles in an effort to shame the viability of owning the console.
5) Already this late into the generation, making Wii games is a moot point, with hardware coming that almost rivals it (3DS, Wii2). Dozens of companies closed down, but it was worth it in their eyes. The Wii may be enduring a little consumer comeback in terms of people liking Nintendo for a while, but that won't last long. Piracy has ravaged the console already, and in terms of software the charts are bare, especially in Europe. In the end, gaming was pretty much divided completely- it became gaming enthusiasts/media versus everyone else ("Casualz")
****My opinion
