The writers have no idea how to end the show so to keep it fashionable with Generation Y Mike, Hank and Gus return as zombies. Walt Jnr. reveals himself to be a werewolf (probably spelled "werewolfe" to be hipper) and Walt and Jesse are vampires/vampyres, Jesse being so after Walt bites him in an earlier episode.
The whole "meth" thing, and or money thing, is an analogy for blood/blood money.
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On a more interesting note the show's underlying theme is
Chirality.
Walt is explaining it to his class way back in S1E2.
Heisenburg is the mirror image of Walt.
Methamphetamine itself is chiral.
Noticed this myself.
Orange on the left. Lemon on the right. Same same but different.
"Perhaps Looking-glass milk isn't good to drink," Alice said to her cat.
