I'd think a reasonable expectation for The Last Jedi would have been about two-thirds of what The Force Awakens earned at the box-office, seeing how that's what The Empire Strikes Back earned compared to A New Hope, and Attack of the Clones earned compared to The Phantom Menace. And guess what? That's exactly how much money The Last Jedi made!
Heck, even Solo was only as much of a disaster as it was because they basically shot the movie twice. If they'd just released the Lord & Miller cut (assuming it would have earned the same as Howard's version) then it'd have been underwhelming for a Star Wars film, but still mildly profitable.
Every time ESB is brought up, TLJ haters (and people who hate Disney-era SW in general) come up with the same tired excuses like "Well, that doesn't count because things were different in 1980 than they were in 1977," as if the industry was in some major transition period. Except it really wasn't. In 1980, movies were still not very front-loaded like they are now. ESB was a slow burner, maybe not to the extent of ANH due to being a sequel, but definitely by today's standards. After three whole months in theaters, ESB had only reached about 70% of its lifetime gross, whereas most movies reach 85-90% of their lifetime gross within the first four weeks in the present day, with opening weekend alone typically accounting for well over 30% of the lifetime gross (even Avatar, by far the least front-loaded major blockbuster of the 21st century, still pulled 60% of its lifetime gross after the first four weeks, 85% of it after eight weeks, and 98.5% of it after 13 weeks).
And the rise of home video wasn't a factor, either. ESB wasn't released on VHS until 1984, and even then VCR penetration was at about 10% of households at the time. In 1980, nobody was going to simply wait for a movie to come out on video and rent it from their local rental shop (if they even had one) because hardly anyone had a VCR and studios weren't churning out home video releases like they were by the end of the decade. Return of the Jedi's opening weekend was the largest ever at the time, yet it was outright modest by today's standards and amounted to only 9% of its lifetime gross, and overall, it had only reached 40% of its lifetime gross after 30 days in theaters. That was as front-loaded as movies got back then. Oh, and ROTJ wasn't released on VHS until 1986.
And, while it has nothing to do with The Empire Strikes Back, there's still been talk about the "dismal" second-weekend drop of TLJ, yet such arguments fail to take into account that said weekend ended on Christmas Eve, which is always a rough day for box office figures. It actually made up for it during the following weekdays, doing massively better on that Monday that the day before. Overall, second-week box office revenues for TLJ exhibited a smaller drop than most other major action films of the 21st century, including The Avengers, Infinity War, The Dark Knight, Black Panther, and Jurassic World. And let's not forget the hate storm had already reached its full fury by then. Fan backlash and negative word of mouth clearly did nothing to dampen TLJ's success.
Of course, when presented with that evidence, then suddenly a big deal is made about the film's performance after the first month. Y'know, after the point when a big blockbuster movie will have made almost all the money it will make. Without internet hatedoms, I never would have learned how important those post-first month legs are. I suppose TLJ did under-perform in that regard, but even with better legs from the fifth week and later, it might have increased its domestic gross by only 6% or so. I know. Such a disaster that it failed to do that. It surely was the doom of Star Wars forever and ever. And Solo's mediocre performance (by Star Wars standards) totally proves it even though we don't have any clear evidence of a causal link between the two. But hey, why let a lack of evidence stand in the way of a good narrative about doom and gloom?
And finally, as for global grosses, the biggest portion of TLJ's decline from TFA was in Asia and Latin America, which were never massive markets for Star Wars to begin with, but where The Force Awakens did surprisingly well. China in particular, after suddenly displaying an interest in Star Wars with TFA, apparently decided it wasn't for them, with TLJ dropping 65% from TFA. Considering the history of Star Wars at the international box office, it's hard to hold those numbers against TLJ. And for what it's worth it actually had a smaller percentage drop in most of Europe than it did in the U.S.
In all seriousness, I think the internet hatedom towards TLJ is just a small but very vocal minority of easily outraged fans who are pissed that the movie didn't play out in a way that confirmed all of their headcanon (or they're just easily offended individuals that have a meltdown if they see anything that remotely smacks of SJW influence, like non-white leads, or powerful women with pink hair; a lot of TLJ hate is simple political natter). By all regards, it was a great film, hence the critical acclaim (91% at RT, 85 Meta, 4 Academy noms, 2 BAFTA noms, multiple Empire and Saturn Award wins). I watched it three times in theaters and own the 4K Blu-ray (Best Buy steel book), and it keeps getting better every single time I see it. But then again I don't fashion myself as an elite gatekeeper of my favorite franchises, which must be treated as holy writ and any changes must be approved by the Council of Nerds before being accepted into canon. I watch movies for the same reason I play video games: to have fun, not to have a religious experience.