Marketed at kids and for kids are very different things. Star Wars is the former, most certainly not the latter. Especially since the sequel trilogy is most definitely here to ravage the bank accounts of people who grew up with the OT.
I don’t see Disney green lighting an R rated Star Wars movie anytime soon, but I could see them doing one eventually. An R-rated, Star Wars film, if done well like Deadpool, would immensely raise the brand cache. There’s a reason Disney is keeping Deadpool 2 and will likely continue to make R-rated materials.
Star Wars is absolutely not a limited universe. Don’t confuse Disney’s ****ups for what Star Wars actually is. The Expanded Universe was arguably bigger than Marvel’s, which is saying something given the EU only started in ernest in the late 1980s, while Marvel has 50+ years of publications.