This Who is Red John Mystery is so easy to solve if i were Patrick Jane, All he have to do is go to each suspect and have a brief conversation with each of them while TAPE their voices and play it to rosalind, she will tell you who red john is. Problem solved but like jane said in his own words in the last episode "the fun is not knowing what's in the box".  So maybe subconciously Jane doesn't really wanna find out who red john is because it puts an end to everything he currently has such as new relationships, friendships, and hidden love crush with lisbon.