Re: How can they keep Cap 3 fresh?
Different country - say England or France. Introduction of Union Jack, kin of Falsworth from TFA. Romance subplot with Sharon. Mostly absent of SHIELD ties. New villains such as Crossbones, etc.
I'm not too worried about them not being able to keep the franchise fresh. Especially with the Winter Soldier character not fully developed yet.
DC on film since TDK-- JH: 2.5/10. GL: 4/10. TDKR: 5/10. MOS: 5.5/10. BvS: 4/10. SS: 3.5/10.