One fear I have about the backlash against TLJ is that Lucasfilm might pull a WB/DC move and make overly reactionary decisions to “fix” things for IX and beyond instead of building on what worked. That was the major problem with both Suicide Squad and Justice League - instead of letting them both run their course and tweaking things from there on out, they made massive changes to both of them throughout production to respond to the criticisms of MoS, BvS, and SS (in the case of JL), resulting in the messy tonal whiplash of SS and the Frankenstein’s mosnter that was JL. I don’t want either of those things to happen with IX.
And before anyone claims that’s what happened with TLJ, it isn’t. TLJ was written and in (pre?) production before TFA even came out. If it was reactionary toward TFA, that was due to Johnson’s response to Abrams’ and Kasdan’s choices in VII, not the audience’s.
Considering the glowing critical reception and box office success, I doubt they’ll let a set of particularly loud fanboys change how they work.