I do want to note that Lorne Michaels is now the Executive Producer, and he is known to be loyal to his stars that are loyal to him. Fallon seems to be doing a great job, and he may be in this for the long haul. Obviously NBC could change things up, but I see it unlikely they find an upgrade anytime soon. Conan was a different story anyways as as already said, it was more about Leno.