Inkscape is far inferior to illustrator, has stability issues, support for filetypes is limited, copy pasting to other software non existant.
Scribus is just awful dogshit.
Gimp is a graphic software that is hostile to UX, not to mention has stability issues, is slow and in every category inferior to photoshop.
Blender is fucking amazing but 3d graphics is not really the same kind of software as the rest. Different type of users use it that have a very different set of skills and needs. And with all video software.
Beyond all of this, even if we ignore all of that, almost all graphic designers use Adobe, companies use Adobe, if you are sending files back and forth, the files have to be Adobe files either for collaboration or for text amendments...
If you are a freelancer and work for any company, they will want Adobe files from you
(I'm sure there is an exception somewhere).
None of this is threatened. If companies don't care, Adobe will go with it. Nobody will switch. Especially because there isn't really anything to switch to. Not realistically.