The only Problem here is the lack of warming from La ninas when in truth La Ninas tend to fit with a back ground warm system longer term.Sort term It is a leveling off but it only supports longer term warming by promoting the continued build up of warm western Pacific Ocean temperatures which are then release in the strong super El ninos.So El nino sort term is indeed a warm factor but long term it is anything but a warm indicator in fact in cold cycles the system was dominated mostly by El ninos and or neutral systems reather then La ninas in the warm cycles the system trended to be dominted more by La ninas then El ninos.I suspect as Phil said when you have a long term El nino driven system with not that many La ninas or year after year of La ninas you lose the build up effect of the western Pacific warmth that is so common in the 2 to 3 year La nina systems as the heat is release into space reather then builds up.So any one that is rooting for a end to the global warming cycle a Dominate La nina system is not what you are looking for or would want to see.Your want to see a system that is less dominated by year after year of La nina phases or cycles.One of the reasons I personalty root for Neutral and El nino type dominated systems and not La ninas lol.The crap that La nina summers can bring here is another reason I don't tend to root much for them.