Hook compared Emma to a shrivelled old bean. She left him at the top of a beanstalk. Romance between these two this season is very unlikely.
However, Hook does seem to have a thing for unavailable women. If Emma maybe has a reunion with Henry’s dad and tries to make a go of it, I can see Hook taking more of an interest in her but as of now he is too focussed on his revenge against Rumple.
Also, Emma loves Henry so she’s not going to leave him for Hook like Milah did with Bae. That would make for some quite funny scenes though if, everytime Hook and Emma tried to have some alone time, Henry would pop up and make it incredibly awkward for them. Henry may also actively work to split Emma and Hook up and push his father and Emma together.