If you don't plan on hacking your Switch, then there's no reason not to update to 4.0.0.I'm not gonna hold my breath or get my hopes up, it'll likely just end up in disappointment like so many great things in life. That said, I need to update my games anyways. I just hope that people don't single me out for deciding not to stay on 3.0.1.
I'm not wanting to hack this thing, I already have all the homebrew I want on my Wii U, 3DS XL, Snes Classic, Wii, etc. Plus I want to update Mario Kart to the latest game version and Sonic Mania for the bug fixes. I don't want to wait around, I hope people can respect my decision to do so. I have my reasons, and I can play all the emulators and ROMs on other devices.
Personally, I always keep my gaming devices on the lowest software versions possible until I can use homebrew. It was years before I updated my Wii U past 4.0.2.