The whole "Tunnel vision" with a specific college by high schooler is a normal phenomena. With regards to which college Rory goes to, I think the writers are just setting us up to pull the rug out from under us and Rory when she'll be forced to stay closer to home (and thereby, keep the show going) next season. This being because they need a 4th season to get that whole syndication thing going. I found it very decent of Rory to go to Dean and tell him that he didn't do anything wrong in their relationship, she just needed to move on from him. The good thing about the visit to Yale was getting into Richard and Emily's backstory, and to find that the prim and proper Gilmores had some drama in the courting days themselves.