This is just a stupid theory whuch would be awesome.
So after Civil War when Cap dies maybe Tony might not be able to deal with the fact he killee him. So because of this he could go into space and join with the guardians. Iron Man does join the guardians of the galaxy in the comics so it could happen.
I would alsol love to see Star Lord work with Iron Man. I dont know what will be in store for [Guardians of the Galaxy 2](movie:1081113) but i hope they try to fond out more about Peter's father. My theory about his dad is that its Thanos.