I'm extremely torn when it comes to these two.
I just started recently watching the show and the first episode I saw was "Rose-Colored Glass" and I thought they were SO adorable when they were dancing together at the end. That was before, however, I knew the deeper plot-line of both the characters and the show altogether. I've been smitten with them being a couple since then but since I am now all caught up I can safely say that I do not see them as a couple anytime soon.
Jane is far too emotionally scared for that and completely devoted to killing Red John and avenging his wife and daughter. Someone else mentioned the episode where the woman asked Jane to come have a drink with them and he said he was married; I absolutely LOVED when he did that! His situation is far different from any romantic possibility I've ever seen presented on TV which Iabsolutelylove about him. Nothing could happen between him and Lisbon right now because he is still in love with his wife and is thinking of nothing but killing Red John. They're friendship is in a good place right now and deepening and developing as the series continues, but Jane still pushes the line sometimes which is already hard to toe with him and it would only be harder if they were involved. Also, as someone else also mentioned, Jane would never enter into a relationship with someone with Red John still at large because he knows that he is always watching. Jane would never put anyone, especially Lisbon, in that kind of danger.
I love their cute and witty banters and casual flirting but I think this relationship won't blossom for several seasons, as it should. That is one of my favorite aspects about another favorite show of mine, The X-files, and how it took Mulder and Scully seven seasons to "officially" get together even though there was heavy flirting and absolutely ADORABLE scenes and moments shared between them, it took a long time for the friendship and relationship to fully develop because Mulder (Jane) was so focused on his work and finding his sister and Scully (Lisbon) was dedicated to doing the job right.
I say give it a few more seasons, actually... if they're gonna get together, it's probably gonna be the last season and Lisbon will get kidnapped by Red John and Jane will have to come and rescue her and kill RJ and then everyone can be happy! Yay!!