First off let me say that I believe that Jane kills Red John. I think this Q & A in a Bruno Heller interview expresses that very clearly ...

Two regulars, Amanda Righetti and Owain Yeoman, are leaving at the end of this season. How has that affected the season and how are you wrapping up Van Pelt and Rigsby's arc?

"It's more the other way around. Even when we capture Red John or kill Red John, it brings down the walls of the CBI to a degree. You can't go around murdering people just because you have a vigilante desire to do so, so it means Jane is in a very difficult position and the rest of the team are in a very difficult position at that point."

Having read that I also think (based on other responses) that Bruno Heller is slightly defensive about the Red John reveal and talks about the show carrying on without Red John which to me means Red John is either an inconsequential character or the story line is much different than we all think and could be seen as silly or anticlimactic.

What I cannot wrap my head around is ...

1. CLEARLY no one on the list of seven is Red John be it for reasons of weight or age or death or whatever. Let's be honest Jane knows for certain that the person walking in this video @ 0:26 is not Reede Smith and Patrick knows that ... http://www.youtube.com/watch?v=MKZvmwU1ufg-not to mention the 6x04 30 second preview http://www.spoilertv.com/2013/10/the-mentalist-episode-604-red-listed_9712.html ... which clearly states the list is fake

2. This is 100% Patrick Jane's voice ... http://www.youtube.com/watch?v=ik4c1OZyomM ...If you skip to 1:18 in the video and just listen to "It's a higher path PATRICK" the grovel in his voice is identical to Jane's. Same frequency, same pitch, same everything. It's the one time where Red John sounds exactly like Patrick Jane. 

So while I believe Patrick kills Red John and the show carries on (which I would enjoy) with a "much more joyous character" as Bruno Heller puts it and a "weight has been lifted" with Lisbon and Jane exploring feelings for each other I also believe that Red John's voice is Simon Baker's voice so I am actually completely confused and that's probably exactly how Bruno Heller wants it

There are not a whole lot of people on the show whom walk like Red John, can talk like Red John & have a slender frame like Red John. I think talk = Jane or his non existent twin brother ... frame and walk = Rigsby ...