I guess people in their 20s and 30s need their parents to buy them consoles.......
Source:
https://www.nintendo.co.jp/ir/pdf/2021/211105e.pdf
Switch isn't a gimmick. it's a console where you're able to play some of the best games in the industry on your TV or on the go at an affordable price.
I know you'd love to believe the Switch is the equivalent of Grandma and baby Billy having some giggles playing Wii Sports for a few random weekends, but unfortunately for you most of the Switch audience is here to stay and will be pumped to buy the Switch 2.
Don't think Nintendo is also after hardcore gamers? Look up the industry veterans they've been hiring for Metroid Prime 4.