It’s become clear to many that Red Hat’s recent missteps with CentOS and the availability of RHEL source code indicate that it’s fallen from its respected place as “the open organization.” SUSE seems to be poised to benefit from Red Hat’s errors. We connect the dots.
Stable means different things in different contexts.
Debian being stable is like RHEL being stable. You’re not jury talking about “doesn’t crash”, you’re talking about APIS, behaviours, features and such being assured not to change.
That’s not necessarily a good thing for a general purpose desktop, but for an enterprise workstation or server, yes.
So it’s not so much that Debian would replace Fedora, it’s the Debian would replace RHEL or CentOS. For a Fedora equivalent, there’s Ubuntu and the like.