As much as folks have been referencing "The Wire," this last episode had me more in mind of the Sopranos. Not so much in terms of similarities, but more in terms of conscious differences. If you haven't seen The Sopranos, do not read further:
Four episodes from the end in The Sopranos, "Kennedy and Heid," Tony reaches his limit with Christopher's moodiness and drug addiction, and (in my mind anyway) goes as far as one can in breaking bad - choosing to kill a member of his family/his protegee.
Breaking Bad: Three episodes from the end, we learn that WW is once again no Tony Soprano. Sure, he hurts Jesse by telling him about Jane, but he is unwilling to do the job himself, nor does he insist that the job is done in front of him. Hence, his protegee lives. Likewise, he fights to keep Hank (his family) from being killed.
Other considerations:
As Newsday pointed out (before I could get to it), the Soprano's "The Second Coming" is based on a famous old poem, Yeat's "Things Fall Apart." Newsday article:
http://www.newsday.com/entertainment/tv/tv-zone-1.811968/breaking-bad-ozymandias-the-sopranos-and-the-endgame-1.6081019 Of course, this episode of BB is based on Shelly's Ozymandias, about the end of empires.
Both are clearly apocalyptic and spell the recipe for the end times.
But, here's hoping that Vince Gilligan learned something about viewer dissatisfaction from the 'fade to black' ending to the Sopranos.
In my view, Gilligan is consciously trying to show that Walter White is not Tony Soprano, and, I desperately hope, we will get an ending to the story of Walter White in the world of Breaking Bad.
****Soprano spoilers finished*******