Topic: What else would be worth "HDing"

@Atariboy
If you haven't noticed, Nintendo has added alot of features people were asking for as far back as Wii U launch. If turning Wii mode into HD can get them to sell select Wii games for the entirety of 8th gen moving past 7t gen, I'm pretty sure it would pretty worthwhile to try and get such an enhancement to work.
Like you said, they could sell Galaxy, Twilight Princess, Skyward Sword, Punch-Out!!, etc. for all of next generation in HD via the Wii U Wii mode.

No doubt it will/would take work, but if it sells more 7th gen Wii software that they can continue to distribute, I'd say it's not out of the question. Just by observing the obvious improvements to Wii mode that today's update has brought, it doesn't seem out of the question.

The ext. HDD is still technically able to be accessed via Wii mode on the Wii U as well. We'll just have to see whether Nintendo takes advantage of the improvements they can make to the Wii mode using the Wii U.

BTW, Starfox 64 on Wii used the Wii hardware to run the game which got rid of framerate "issues" in the original. They eventually updated it to run like it originally did, in terms of slowdown.

You'll see a small selection of Wii and GC games on the eShop rendered at 1080p with the same assets before you'll see full support for rendering Wii titles in Wii Mode at 1080p. Don't take that as me saying it'll happen, take it as me saying how unlikely I think it is

They could still sell WiiWare games on the eShop, you would just have to boot them up via Wii Mode. Maybe Wii Mode will disappear if Wii U takes complete control of it, though.
Who knows.
I honestly didn't think Wii Mode would get surround sound or GamePad support, but it happened. Not because I didn't think it could, but because I didn't think that Nintendo would do that.

The Wii U would still have to access Wii Mode, it would just do it for you automatically. Right now, you have to go to Wii Menu and boot up a Wii game manually.
If the Wii U ran Wii games from the Wii U menu, it would still be doing all those manual operations automatically. The Wii U would access your Wii WiiWare game by selecting its channel on the Wii menu, you just won't see it happening.

Maybe these gradual improvements are necessary in order for it to be automatic and integrated. Again, all speculation.