I'd also add that Solo's PR campaign was a bit of a mess. We heard nothing of the film for most of the year, only to get drowned in stuff from April onwards, and very little of it seemed to really portray the film's strengths beyond "look, here's more Star Wars".
To O.P. - I don't think the anthology films are dead but Disney and Lucasfilm are going to have to reconsider their approach. For one thing, if they're going to look for distinctive creative voices they're going to have to accept those peoples' ideas may not fit the established mold (no, I don't know if Lord & Miller's ideas for Solo were better than what we got but it's not a great look to fire guys like that and replace them with, apologies to Ron Howard, a talented journeyman). They should also consider that, if these films are going to be laser-targeted at the most dedicated fans of Star Wars (which Solo absolutely was - I can't imagine a more casual audience ever wondered about Han's past or even knew what a Kessel Run is), they're just not going to be as successful as the core saga, and maybe it would be best to see about making them more economically. Granted, Solo's budget spiralling up to and beyond $300million was in no small part down to the reshoots, but even so, does a space western about a smuggler and his hairy friend need to cost half of that? I'm not convinced it does. If they can make a Star Wars film for under $100million and it 'only' makes $500million global, that's still a big success, relatively speaking.