First to say I do think Switch needs third party support, most important I have check many video on Youtube from my favorite Youtube going back and forth about whether third party support is import for Switch or not. My stance is they need to come but shouldn't be like the Wii U when it first launched, most of those third party game were rushed and eventually didn't sell well. Also it was hard to develop games on the Wii U.
I especially think those saying Switch will fail due to no third party support is an utterly dumb statement, Switch does get third party support already, just not on the scale where new upcoming games are coming to Switch and on par with PS4 and Xbox One. I just think they are just jump the gun too often.
While I personally don't think Switch will eventually those common third party titles like Call Of Duty, Overwatch, Grand Thef Auto etc. I think as long as Switch receives third party exclusives like how the 3DS is will be just fine.
My question is on your last statement "Nintendo loses badly every time they do not come.", it isn't always the case if you know Nintendo hasn't get that good third party support ever since N64, sure Nintendo "lost" to Sony but it still manage to sell over 30 million. Wii however was something entirely, Wii U you can say lack of third party was the key failure but there were other reasons why Wii U didn't sell well. And then if you look at 3DS this nearly against that statement, 3DS didn't get that much third party support but it still beat Vita with a huge margin.
Edit: and I dd post again...