I have wondered if possibly there might be some rivalry between St. Luke and St. John? For example at the time when St. Luke wrote the third Gospel it was really the longest and most detailed and contained information about Mary and especially the Annunciation that the first two Gospel writers did not include. And then St. John one-ups him and writes not only the longest Gospel, but includes details about Mary at Cana, and even mentions that she was given to St. John to take care of by Jesus. Certainly the reason why there are no more Gospels after St. Johns is how can you beat his prologue, Chapter 6, or his theological writing style.
St. Luke though decided to write a sequel to his Gospel, the Act of the Apostles and instead of following the actions of someone like St. John decides to concentrate on St. Paul instead.
Now you really have to wonder what St. Luke thinks of the Book of Revelations written by St. John? Especially when he came across "So, because you are lukewarm, and neither cold nor hot, I will spew you out of my mouth." Lukewarm? Why Lukewarm. Why not Judaswarm? Or perhaps Ananiaswarm or Sapphirawarm. Surely if St. Luke wasn’t in the beatific vision this would have been seen as another snub by St. John towards him.
You also have to think that St. Luke must have been pretty pleased when Star Wars came out. Finally Luke is not associated with vomiting and Luke is actually the hero. Saint Luke use the force and pray for us.