"Absorb the Wii Us architecture"
Anyway, to be frank, that's too bad for you. It doesn't matter that Wii Mode lets you play physical games. If the Disk drive wasn't on the Wii U, Wii mode would still be a BC feature, which is what we were debating. For people like you, it would be useless. That's too bad. Doubt you have absolutely zero digital games on your system, but who knows.
For everyone else, the library is all there. With BC, they don't need to do what MS and Sony had to do. Instead of wasting money, time, and resources remastering year old games, they'd have every Wii U game, retail, indie, AND VC, available on the eshop marketplace, which would be the NX's main marketplace, day one for purchase with the same exposure as any new game on the system would have. Then they could focus there resources on other content instead.
How is it a waste of resources? look what wonders it did for the sales of PS4. People were happy to get an upgrade with all the DLC and a few extra maps, even people who owned some of the games repurchased them.