Gonna be a bit of a dick here, but Nintendo don't need Wii U owners to like this lineup.
There's going to be what - at most 15m Wii U owners at absolute maximum by the time the console is done.
For lack of a better word, these people are either the Nintendo superfans, who bought the console because it was a Nintendo console, or they bought it because it has a solid lineup of first party stuff in the first few years and they like Nintendo first party.
Both of those groups of people are, presumably, going to be on board with a new Nintendo console which is going to be the focus of their development studios going forward no matter what. They'll make their purchase sooner or later became first party will always be there, so during the first year - why not attempt to appeal to the wider audience who wanted one or two of the Nintendo games on the console but didn't want buy it? They weren't on board with the Switch regardless but something like this might sway them.
*shrug*
