I don't know what happened to Arrington really
Arrington was never a good corner, especially a "cover" corner. He was in the same league as Ellis Hobbs, and that is probably why Arrington changed his number from 27 to 24, people thought Hobbs was back.
What helped Arrington look good in the eyes of many fans was a number... the number seven. Youhave no idea how many times the number of interceptions he had last season, a team leading 7, has been mentioned by people saying he is a good cornerback.
And, I tell them all the same thing, go and look at the videos of those seven interceptions. What they will see is, perhaps, one of the luckiest players on the field.
On five of those interceptions, and this is not a lie, he was out of position. No receiver near him. He was standing alone and the ball was either tipped to him or it was a badly thrown ball by the quarterback that sailed right to him.
One of his interceptions that he got credit for was when he was laying flat on the ground and the ball, actually, rolled onto his stomach. Go ahead, be my guest,go back and look at them and that is exactly what you will see.
What I DO give him credit for is good yards after the int. However, that might be a little skewed also as there normally isn't any opposition receiver anywhere near him to make the tackle because he has been beaten so badly.
So, to answer your question, "what happened to Arrington?" The answer is simple, His luck ran out.