I understand what you're saying, as I am also a parent. However, here is what I love about the Switch; If I want to play PES on PS4, my son can simply play the Switch in handheld mode. We did this with the Wii U, and it was perfect.
I, as an adult, am getting BotW, MK8D, Snipperclips, Splatoon 2, Fire Emblem Warriors, and Mario Odyssey this year. My son will obviously play those games, too, but he is also excited about several other titles that I have no interest in.
All things considered, though, had I not gotten more for my Wii U than I paid for it, I wouldn't be getting the Switch at launch. It was very close to a straight swap.