I think we've gone from wonder nines to wonder .380s. Time will tell, but if the popularity continues for the next two years, that will be the answer. Everyone is building one now. If it wasn't for Obama-mania driving AR and higher-capacity 9mm sales, the .380s are all you'd hear about. Easily concealable, light, almost powerful enough for self defense.
Of course, Obama might make the .36 cal BP Navy revolver the (only) handgun of the decade before we're into the twenty ought-teens.