As much as i would love a new Wii Sports, i don`t think it really suits the gamepad.
These type of games are great for the Wiimote or Kinect because you can move around freely and mimick something.
So, basically, Nintendo would have to, in order to not confuse people and provide the most ease to use experience, sacrífice one of the controllers - naturally, the gamepad.

Unfortunately, Nintendo hasn`t positioned Wii U as a true sucessor to Wii. So, most likely, people would dismiss it as Wii`s time has passed.

Either wait for Wii U`s rebranding or risk hurting the franchise.

The distribution model for Sports Club was really poorly thought out IMO. Why didn't they just have a season pass? Why has it taken so long to get all the sports available?

Same story for really ANY WiiU game. Wouldn't be the smashing success the original Sports Resort was, but it's one of those things that vindicates the WiiU existence. It's the kind of game you feel comfortable showing off to your extended family and small children. That's an experience lacking on the WiiU that was so crucial to the original wii's success.

better be called Wii U Sports Resort 2.

You wouldn't have to ditch the wii-mote -- you wouldn't have to make the entire game gamepad compatible either.

You'd basically use the Gamepad to augment the experience where possible. Best example I can think of would be golf in Wii Sports Club.

Driving/Flying/Aiming with the Gamepad would work fine. Among other things, there's some unexploited potential here.

Exactly. Gamepad + WiiMote in a new WSRU game could offer one of the best local co-op/competitive experiences on the system yet.

Some of the games done a larger scale online (like up to 64 players) would be very, very interesting

No question.  They were trying to toy with the idea of online distribution and subscriptions, I think.  Poor product to do it with though.  Sports Club should have been a pack-in from the get-go.  I think it was a bit of an afterthought and done with a small team/Namco.

I understand that the Gamepad can be helpful and who knows, even crucial to some mini game.
Actually, Wii Party U had a great minigame that utilised the gamepad and the wiimote together (the one where you transfer fish or water from the gamepad to the TV. can`t remember).

The question is, would it make for a seamless experience having to jump from one controller to another?
To me, that`s one of the things that hurt NintendoLand. Telling people to buy a Wii U for the game and also an extra controller to play a game, doesn`t help dissipate the Wii-Wii U brand confusion.

The one controller option is always the best option for consumers.