I think Rogue was perfectly introduced in X1 as one of the main characters of the story. She grew as a person in X2 and has been utterly destroyed in x3. But I think the development would have been great if X3 would have let her arrive at a new "sassy" empowered version of herself giving her moments enjoying her powers instead of letting her succumb to her self-hatred being a mutant and retroactively destroying the character in the entire trilogy.
After seeing the new Eternals trailer (which absolutely blew me away), I cannot wait to see Marvel's take on the X-Men. although I still have the feeling Eternals makes it difficult to introduce the X-Men as their own unique I.P. No idea how Marvel can make the X-Men exciting again. Icarus seems to be the better Cyclops.
X-Men 2, Days of Future Past, and Logan just are so perfect as X-Men movies that I have no idea how Marvel can really top that and capture the essence of the X-Men without feeling redundant.