Here are the first full quarter sales for 3DS, Vita, Wii U & PS4.
3DS, April to June 2011-350k (27k/week)
Vita, Jan to March 2012-200k (15k/week)
Wii U, Jan to March 2013-225k (17k/week)
PS4, April to June 2014-125k (10k/week)
Vita, Wii U & PS4 are all dogshit terrible so it would really be pathetic if Switch dropped to a similar baseline. 3DS baseline was better but still rather poor.
Under 30k baseline would be pretty disappointing for Switch, 30-50k would be good and 50k+ would be great.
When the herd loses its way, the shepard must kill the bull that leads them astray.