I’d argue they’re was atleast some initial jealousy or resentment for the character from the Titans fan base at the very least. I honestly think of Cyborg was just handed a book at the start of the New52 it would of struggled. I think Aquaman’s success in the New52 comes from the buildup before he got his title.
Personally I would of argued the best course of action would of been having stories at the end of the JL book that focused on Cyborg similar to what Johns did for Shazam. Whether it be Johns doing it himself or whoever would of eventually penned Cyborg. I think it would of been the way to get people talking on wanted a separate title to collect Cyborg’s stories similar to the want there was for Johns long awaited Shazam book
It’s possible it would of worked though at the start of the New52 but it definitely would of needed a leg up like some high profiled writer to garner interest or an event like Origins or Forever Evil to kick it off.