Watched "The Kid Who Would Be King"! I kept wanting to call it "The Boy Who Would Be King", but that's probably another thing with a similar premise. It's a great premise, and I shall never tire of it. Modern kids get involved in medieval nonsense! Give it to me. I still remember watching "A Kid in King Arthur's Court" or whatever it was when I was little and not knowing what a Big Mac was. From context, I assumed that it was slang for "hamburger". Or maybe a specific type? Close enough.
I also kept thinking that Bill Nighy was going to be adult Merlin in this because I vaguely remembered hearing that the actor was some awesome old British guy. Who turned out to be Patrick Stewart. Very different flavour. But either could have done it.
But yeah. Kid knights. Always good.
Next medieval blend movie the world needs?
If there simply must be a breather from kid knight stories, let's go with Muppets. They've done pirates and space. Let's see them get medieval.