First time I hear an emacs user saying so lightly that he wants to move to something else, how well do you know emacs?
The other thing holding it back is performance. It might be something that Atom can never be "good enough" at, but I have hopes, if only with increases in compute speed.
(It sounds a little like you think that the only reason everyone doesn't use Emacs is the steepness of the initial learning curve.)