Will the Switch surpass Xbox One sales by the end of the generation ?

[Slownenberg]

Well lets see. Xbox probably be low 40s end of 2018, high 40s 2019, under 55 end of 2020 when probably successor launches.
Switch will be high 20s end of 2018, mid 40s end of 2019...so yeah Switch will pass Xbox sometime in the first half of 2020.