VGChartz is literally the only place on the internet I see such pessimism for the Switch that I'm seeing in this thread. I think matching 3DS sales of 4 million is a very reasonable prediction- on the upper end of the sales I'd expect, but not completely ridiculous like some of you are making out.
$300 is not priced poorly. It's the most powerful handheld system on the market, is cheaper than its competitors, and is a breath of fresh air in a stagnating console market. I have no doubt the Switch will be very successful.
I don't understand it either. One big thing that we fail to understand in the west is that the price of the Switch in Japan is the equivalent of $264.00 in US dollars -- a price which amazed a lot of Japanese developers for what the conosle offers. Also, it has a games lineup that's more appealing to Japanese audiences than western ones, it's seen as an end of Nintendo's handheld/console market split, it appeals to current portable gaming trends in Japan and it's essentially replacing three platforms in Japan: the 3DS, Wii U and Playstation Vita. When I take things further into consideration, 4m by the end of the year in Japan (or 'end of the fiscal year') seems attainable.