Honestly I don't think they will change the ending of this, and its not true that the ending was just too easy, im just gonna say this but the outcome on the ending was selected by jinwoo himself , and while it might seem a bit farfetched ending some of the LN readers must have forgot his journey in obtaining his ideal outcome (you'll understand if u read ln).
Storywise it looked easy, but it is realistic in the grade of the plot given in the story, for me it suits the story well as ending, but yeah it doesn't have the knocker effect that some of the best animes have in the ending. But since it gives a different feeling I think this can be overlooked.
I saw some people wished Solo Leveling to have a little bit different ending compared to the novel because they said the ending was kinda too easy? Idk myself I haven't finish the novel but is it true? Is it possible to create different ending?