I agree with you. Wishing the end of XF equals wishing the end of Gillian’s caree. It’s odd that her hardcore fans can’t see it.

Well, that’s because her hardcore fans believe that as soon as she drops XF, she’ll become an A-list actress winning Oscar after Oscar and finally have the recognition she deserves.
It’s not realistic at all.
I don’t know if the end of XF equals the end of Gillian’s career but it certainly will lower her exposure, especially living in the UK. I think it all depends on what you want for Gillian. I want her to keep doing big international projects in which she has leading roles, and I don’t think there’s anything but XF that could give her this chance so far. So be it!
If you want Gillian to show of all her range as an actress in smaller roles in smaller projects, then yeah, I get their point. But I don’t believe that’s what Gillian wants for her career.