She is 100% the next EN graduation, btw. Not that it'll happen soon, but that she is without a doubt the next one.

>Kiara
She's unironically getting to do everything she wants to do as a western idol. No reason to leave.
>Mori
Cover allows her to do whatever she wants to outside of Holo anyway, so why cut off half, if not most of, her income? No reason to.
>Ina
Doesn't have a reason to leave because all her content is generally very low-effort anyway.
>Ame
Same as Ina

>Mumei
Slowly climbing to the top of Council numbers-wise. Which, obviously isn't much to brag about, it's Council after all, but still.
>Kronii
She's on a journey to change the unfortunate idol culture of Hololive. She will probably leave relatively quickly, but not before accomplishing her homobeggar goals.
>Bae
Unironically being slowly inserted into Gura's position by Cover. Not that the fans are treating her that way at all, but Cover themselves are treating her like the new EN mascot. Probably for no other reason than because she's an extrovert who can speak JP.
>Fauna
No reason to go, she's just kinda chilling.
>Irys
Same as Fauna.

So, yeah, no matter which way you slice it, Gura is certainly the most likely EN to graduate next.