Nobody have forgotten I hope all these insult received when we were a few 2 years ago to say that there would be no "Switch Pro". I was one of them so I have not forgotten.
If it can output at 4K in docked mode, it is absolutely more capable than the regular Switch, therefore it should be able to bring games at greater resolutions and performances. To me, that just sounds like the PS4 Pro or the New Nintendo 3DS.
My bet with The_Liquid_Laser: I think the Switch won't surpass the PS2 as the best selling system of all time. If it does, I'll play a game of a list that The_Liquid_Laser will provide, I will have to play it for 50 hours or complete it, whatever comes first.