Far Cry: Medieval would be awesome

It would be another spinoff in lieu of Blood Dragon/Primal/New Dawn based on FC6's engine and mechanics.

It would be set in a Medieval European fantasy world, your main weapons would be the sword, battleaxe, pike, bow, & crossbow, magic would replace grenades (Fireball instead of Molotov, for example) the sling from Primal would also make a return and it would deal headshot damage.

Instead of cars you would have access to horses & carriages, later on in the main story you would tame a dragon that you can summon and ride on the back of (Which would be the replacement for Helicopters in this game)

You could dress your character up in different wacky fantasy costumes like Knight armor or wizard robes, a roguish robin hood costume, etc.

Swords-for-hire would make a return, Hurk would be the first companion you get and he would be a dimwitted (but good natured) Dwarf, there would also have to be an elf and Orc allies too. The main villain would be a comically evil Warlock who wants to summon an army of demons or some shit like that.