For the moment, the focus is all on the new cast that started in X-Men: First Class and will appear next year in X-Men: Dark Phoenix.
It may be a bummer for Rogue fans, but Anna Paquin is probably right.
Given the way the story has gone, it wouldn’t make a lot of sense for Rogue to show up now.
X-Men: Days of Future Past was basically a swan song for the original X-Men cast with the exception of Hugh Jackman and Patrick Stewart, but their time as mutants appears to be over now too.