Totally agree. This current strategy of making HD/Wii U versions of all the games in the 3DS library is foolish. Sure the Wii U ones are generally more expansive and have more content/options and are designed with longer play sessions in mind, but other than that it's just a fresh coat of HD paint...not enough to justify twice the cost for the system and a 50% markup for the games for most consumers.
Why Wii U needs an open-world, 3D Zelda title, games like "X" and Bayonetta 2, and a true single-player epic 3D Mario title...among other things. Wii U games need to offer drastically different experiences than what you can get from 3DS games. Unfortunately 3DS is powerful enough that it allowed them to make the types of games they've gotten so used to making for over a decade...almost any Gamecube or Wii title could run on 3DS...so they made "console-like" games for 3DS, but just altered the gameplay so they would be suitable for short bursts of play (something Sony and the Vita haven't quite figured out...or at least didn't right away). So now, unfortunately just having the same games, but in HD and without the "short bursts of play" alteration, the Wii U games aren't different enough to justify the cost...unless you're a Nintendo loyalist.
Upcoming Games To Get
Definite: Kirby Star Allies (Switch), Mario Tennis Aces (Switch), Fire Emblem (Switch), Yoshi (Switch), Pokemon (Switch), Kingdom Hearts 3 (PS4), Monster Hunter World (PS4)
Considering: Fe (Switch), Donkey Kong Country Tropical Freeze (Switch), The World Ends With You (Switch), Ys VIII (Switch), Street Fighter V: Arcade Edition (PS4), Kingdom Hearts 2.8 Remix (PS4), The Last Guardian (PS4), Shadow of the Colossus HD (PS4), Anthem (PS4), Shenmue 3 (PS4), WiLD (PS4)
