Well i read a report yesterday that Nintendo has officially announced that Zelda will be the last Wii U release title. They were also asked about bc and as of now there will be none other than however the eshop purchases will work.
Both of these things are extremely likely. Nintendo will likely have no more first-party titles on the Wii U. There's no reason to doubt that statement. There may be additional 3rd party games, but I wouldn't expect much. With the console holder themselves bailing, it is unlikely that 3rd party developers and publishers will hang around afterwards. Zelda Wii U may not be the LAST title released for the Wii U, but it is going to be close.
And backwards compatibility for the Wii U on the Switch is not impossible, but extremely unlikely. The Wii U, with it's streaming video between the tablet and console, was a much more esoteric design than what the Switch is proposing. It would not be possible to provide proper backwards compatible support to the Switch without additional hardware, and that's just not happening with the Wii U's miniscule user base. There aren't enough current Wii U customers to make it worth the trouble.
- Vulsker likes this