I noticed it recently passed this milestone. I remember for years there were debates on who would sell more between Wii u and vita. Who would finish last for the gen. I think it's settled now even taking into account the margin for error.
That was settled once Nintendo (wisely) pulled the plug on the Wii U after 4 years and 3 months, compared to the Vita which has been on sale for 6 years and 7 months. Of course with over 2 years less sales data the Wii U finishes with less sales. But, if we're being honest, they both finished last. Wii U (13.9 million) was last to it's direct competitors Xbox One (37.7 million) and PS4 (80.1 million). Vita (16 million) was last to it's direct competitor 3DS (72.2 million). Nintendo purposely pulled the plug on the Wii U rather than trickle in sales to make way for the Switch which sold more in 1 year (17.8 million) than the Wii U managed in 4x that amount of time or the Vita in over 6x that.