If Red John returns- will there be a bloodbath?

One of these day there will be a TV series that will get it right. They will build up the plot and characters to an all out horror story. However the question stands: Is Mentalist "the one"?

Let's see:
FBI Johnny's come lately = bunch of uninteresting characters = yep, murder at will (heck, I'll even hire Red John to get rid of them)
Cho = needs a human companion to be funny, otherwise douchebag of lately = kill him... go ahead... see if I care
Lisbon = boss we all dream to have turned to a bi... ahem... love interest to two = sorry to break it to you Honey, you chose the wrong guy, this puts you on the murders list position #1. It's nothing personal... It's not you... It's who you with.
Jane = a loving Father and a husband on a revenge mission with shady past and with a double homicide track, engaged in law breaking left and right = is Red John the elephant in the room?

Well, so far so good, but I doubt the writers will take this route. Simply because they never heard the expression "when the cat's (BH) away the mice will play"

But...

I have high hopes for Sons Of Anarchy.