I don't think Marvel would introduce Hawkeye in AoS as having him in there might seem too much like Arrow. Either he'll remain on the big screen or won't be around at all.
I think Arrow would not even be a consideration for Marvel if they wanted Hawkeye to appear in AoS. The two characters really are not similar and of the two, Marvel has the more widely seen one. They would give the comparison less than a thought. Now, would Renner be amenable to doing a guest stint? I'm leaning towards no, because oddly enough, of the actors in Marvel's stable he seems the least likely to make a TV appearance. That said if he was really interested in delving into the character, then this would be the way to do it.