Honestly, it would be hilarious if they did a goofy, “coming out tomorrow,” April Fools day announcement, and Nintendo snapped back the next day with “no, really, available now!”
There are just to many restrictions on streaming. For local streaming you need to first, buy the original console and then buy additional hardware to stream to. And then you are still tied to a single network.
For cloud streaming you need to have a reasonably fast and reliable internet connection which is just not conducive to many of the situations one would want a portable console for.
Once an account is set up on a switch your kids will not need to remember password to access it. From what I recall the only time you might have to recall the password is to add funds to the account to buy games on the shop.
There is a companion parental control app that allows you limit screen time or access hours and filter games by age rating. You’ll still have full access to the console through a quick passcode.