Maybe.
I am a Nintendo fan but the power of the Wii U and the gamepad itself are only excuses some developers use not to bother with it. Unless the Wii U was a carbon copy of the PS4 and Xbox One, the developers and publishers would find reasons like the audience as to not support it because any extra work/time/money they put into another port to them is a loss.
Its why some PC ports are usually not released along side their console counterparts if at all. Short of Nintendo dominating with the Wii U, having the power comparable to PC mega games AND a massive hit that drew in the modern casual 'core' gamers that by annual releases and could potentially be imitated they wouldn't have gotten the third party support from the major publishers to win this generation.
Maybe if the Wii U came out in 2010/2011, maybe if there was no Gamepad, maybe if it was more powerful, maybe if it saved mankind from a alien invasion... etc. But even with all those maybes, there are plenty of elements in play that could have torpedoed the system.
Heck look at the 3DS in Japan. It is obviously the winner of its generation in that country but look at the way 3rd parties treat it. Despite being the top hardware week after week, despite having the most hits, despite being more powerful and capable of handling some of the games they put on the Vita, aside from a few stalwart franchises from certain companies, it mainly gets licensed family/youth games, while the publishers throw key titles at the Vita mainly because it can share development with the PS3/4 and the perception flawed that it is that certain games sell better on Sony platforms.
Logic does not always go hand in hand with what is done in business or retail.