I'm also in the "no romance at all" camp for this film. The heart of this film should be Steve/Bucky, and I'd rather not see anything take focus away from that. If there has to be romance, though, then it should definitely be for Steve, this is his movie, after all. Shoehorning in a secondary romance between two supporting characters just sounds like a bad idea all around, IMO. Besides, I'd prefer to see Natasha remain independent and kickass, not to mention normal. There's enough serum enhanced people around now, I hope Marvel leaves her agelessness out of the MCU.