Fims about heroes that we know how they gona die

If the story is good enough, knowing the final fate of a character shouldn't be that much of an issue. Look at the movies about historical figures.
As for Han Solo, "fans" keep calling him a "mystical figure" and, at the same time, keep arguing how much they hate the idea of recasting and how they don't want a movie about his backstory. Well, he either isn't a "mystical figure" at all, or I don't see any problems with recasting or backstory movies.

 

It's not about the character's death or end, no it's about the knowledge that the character won't die in the prequel. This is the real problem of prequels, the stakes aren't high enough for certain characters.

We can't tell whether it's sad or not. We have to wait for Kylo's fate to answer this.

 

Spoiler...they are all likely dead they told you from the jump that this is a long time ago, in a galaxy far, far away.

The boat was already sank in Titanic but it is still the second highest grossing film of all time.

The key is to tell a good and compelling story and less checking off cannon event boxes.

With this though my primary theory is nothing this deep is the key.

I say start out with getting a handle on the effectiveness of the marketing to general audiences and brutal levels of direct competition and worry about getting into the weeds later with pet theories later.