There is already an updated akmod-nvidia 418.74 that is compatible with 5.1 in repos.
So if you have kept the rpmfusion-nonfree yum repository, you should have received the update few weeks “before” the kernel 5.1 update was moved to stable (in either fedora or silverblue).
The same apply with wl-kmod (despite there is another issue there because of wpa_supplicant incompatible feature that is been worked on).
About been left with a broken system with nvidia, this shouldn’t be the case anyone thx for the nvidia-fallback service that I’ve designed (as RPM Fusion nvidia package maintainer) on the original idea from Hans de Goede , from Red Hat.
Basically, if anything broken with nvidia, the fallback service will enable nouveau so you won’t have a broken system.