If the previous trilogies are anything to go by, then this movie should make more than TLJ but less than TFA. Should the results be actually worse than TLJ (which would surprise me)there will probably be a lot of discussion about reasons. Those who think Last Jedi killed Star Wars will be “told you so”, others might argue there is a fatigue caused by to many movies/ the spinoffs. That’s most likely what Disney would assume. They already think it’s the main reason for Solo underperfomance.