My prediction about Varga and Widow Goldfarb was correct, except that I predicted that they were not working together.
Emmit leaving the phone behind really bothered me, as well. Stepped on or not, it wouldn't be hard to extract his name from the phone and tie him to the shooting.
Emmit didn't deserve to die, while Varga deserved to drown in a vat of his own vomit.
I agree with those who found the ending not cleverly ambiguous, but rather a failure by the show to take a stand.