The vast majority of people that are willing to spend money at a Disney Park would rather have a chance to interact with Mandalorian era Han than any of the new characters from the trilogy series. That is the reality Disney, their bean counters and the Imagineers know they are operating in. They need to have a land that will attract the most costumers from around the world to it in a post pandemic world. If that means they have to change the story of SWGE and swap out characters, they are going to do it. The Wizarding World worked because it was an immersive experience with characters that connected deeply with a large audience. Disney needs characters in SWGE that connect deeply with a similar sized audience.
You're still missing my point. Adding characters/events from different time periods would make SW:GE disjointed.
Yes; I would absolutely love to walk around in an environment with original trilogy characters, and I would have no issue with them completely overhauling SW:GE entirely to reflect Batuu at an earlier point in the timeline, but it would be really jarring for me to see characters from earlier timelines standing next to the sequel-era T-70 X-wings that they have in SW:GE, or embarking on missions set 30 years apart from the same location. So unless they re-theme Rise of the Resistance (which won't happen) and replace some big set pieces, that means sticking with the sequel-era timeline. "Star Wars" is more than just the original trilogy, so, regardless of my love for the original trilogy, or how I feel about the sequels (I hated The Last Jedi), I'd feel more connected to the bigger Star Wars universe as part of a cohesive experience than I would from a stitched-together patchwork, even if it meant not seeing my favorite characters.
If SW:GE had been themed to the original trilogy (as you seem to have wanted) and they decided to add prequel characters like young Obi-Wan or Padme, or had both prequel Anakin and Darth Vader, would you still be just as okay with them mixing time periods?
You're projecting your feelings about the characters *you* connect with onto everyone else. "Star Wars" spans over 40 years, so people's connection with the universe can and does vary by generation. Old fogies like me have a strong attachment to the original films because they *were* my childhood, but I know many Millenials who prefer the prequel films (god help them) because they are what "Star Wars" was when they were kids. Similarly, I've seen numerous videos of young kids at SW:GE who are overjoyed to meet Rey, so you can't say there's no connection with new characters (and I'd wager many of them couldn't pick many original trilogy characters out of a lineup), and despite a rise in childless adult guests, Disney Parks are still mostly a place frequented by families with young children (and strollers... so many strollers). In addition, many of the general guest population wouldn't know the difference between Han Solo and Luke Skywalker let alone the difference between original and sequel characters and would think it was exactly the same regardless of what characters were walking around. Given all this, your unsubstantiated claim that the "vast majority of people that are willing to spend money at a Disney Park would rather have a chance to interact with Mandalorian era Han" is on shaky ground at best.
Do most guests care? Nope. Will Chapek do whatever he thinks will make the most money in the short term? Yep. Am I allowed to be disappointed if/when it happens? Yep.