Oh SLS going nowhere fast. pic.twitter.com/OKqKtFz4ft
— Scott Manley (@DJSnM) October 5, 2018
This makes sense. Block 1B was supposed to handle everything after the first launch, but recently a lot of missions were moved to Block 1.
I'm not sure how to feel about this. SLS is a big expensive rocket that has slowly lost most of its reasons to exist, but it isn't useless. Cancelling it could mean less money to space programs in general instead of that money moving over to launch payloads on different rockets.