I'm assuming this thread is being made in response to the recent NoA news, but like... I don't think it's a confirmation of being delayed again. Idk why people are thinking this.
Anyway, the Wii U's big issues came down to marketing and also lighting the candle too far away from release. When the Wii U was announced in 2011, it was a full year and a bit before the console released with a piss-poor announcement. The release had poor software, terrible marketing and a lack of incentive to buy it. I don't think Nintendo biding their time is too big of a problem because the Switch is still doing well for the time being. It's only going to be an issue when the Switch's momentum disappears for good.