Welp...with the trailer for the Expansion Pass establishing the return of Talonflame, I honestly find myself wondering if we need to reassess this mon.
Talonflame definitely outspeeds Corviknight, and it has access to Flare Blitz...of course, it also takes 4x damage from Stealth Rock...
You're comparing apples with oranges. If Gale Wings is still nerfed, Talonflame is near irrelevant in OU, and if it isn't, the two still serve completely different roles. Plus, Talonflame can't come in on Corviknight because:
0 Atk Corviknight Brave Bird vs. 0 HP / 4 Def Talonflame: 153-180 (51.5 - 60.6%) -- guaranteed 2HKO
The confirmed returning Pokemon that actually makes a significant difference for Corviknight is Magnezone, which might start forcing people to run Shed Shell, U-turn, or Body Press more consistently so it can't trap for free. However, regardless of what is released, Corviknight is still one of the sturdiest pivots / defoggers / bulky set up mons in OU and will have a place in the metagame checking dangerous new threats like Garchomp and Landorus-T.
All that said, let's not derail this with speculation.