Nintendo Wii: Sold like gangbusters.
64bit Processors: The computing standard.
Battlestar Galactica: Considered one of the greatest sci-fi series of all time.
Facebook: Continues to be the world’s leading social media platform by literally BILLIONS of users.
High Definition: HD only got even more HD.
iPhone: Set the standard for mobile smartphone form factor and function to this day 16 years later.
The Wii U was an amazing platform specifically because of the second screen. It lended itself nicely for asymmetric multiplayer (Rayman Legends is so good on the Wii U) and the ability to play without using the TV is also pretty nice.
Yeah marketing was certainly an issue, but the other issue is that the Wii was mostly owned by casuals and casuals don’t need to upgrade ever.
Hence why the Wii received it’s last game (Just Dance 2020) a whole year later than the Wii U received it’s last game (Just Dance 2019).