I think they made a mistake announcing the trilogy so soon, especially when there was no concrete idea there yet. It puts Rian in a bit of an awkward situation where now the press is going to be constantly asking him about it until he full-on confirms that it's not happening anymore. And who knows...Lucasfilm could be stringing him along too and making promises that they may or may not keep. That said, nothing would bring me more joy than to one day see an amazing episode of The Mandalorian or another SW show that fans are absolutely loving, only to have "Directed by Rian Johnson" at the end. Just to melt brains and watch the cognitive dissonance ensue. That's my bet. I think even if Rian isn't getting his trilogy, he'll doing something with Star Wars again. I don't know why, but I could just see it happening. He does have a relationship with Filoni and consulted with him on TLJ.