2 possibilities.
1st possibility: The WiiU have a "normal" successor. It's announced in 2016 and released in 2017.
2nd Possibility: The Nintendo Fusion is real, it's the successor of both the 3DS and the WiiU, it will be announced at the end of 2015/early 2016 and be released by the end of 2016.
Anyway, the QOL will probably be released in 2015, and we'll see how it will change things.
Always remember that the Nintendo DS WAS the successor to the GBA, Nintendo told otherwise because they wanted to keep the Game Boy brand in case the DS wasn't a success.







