The lemoning, in my opinion, is a catch-22. Some believe that you need it for good pigment but it is not desired. Good pigment (the black points) is required in our standard. Personally I would rather have a bit of lemoning on the ears than poor pigment.
If your dog is out in the sun it can actually get darker due to the pigmentation. I have excellent pigment here at my house but I also do have some dogs with color (lemoning) in their coats........not all of them but several do. I had one girl here that during her show career, I could not let her go outside because if I did she would get the lemoning down the part of her back and of course her pigment was gorgeous with or without the added sunshine......she is now 7 years old and has never had winter nose....in fact there are only a couple of my guys whose pigment has faded with age.
So to answer you question.....it may go away as your dog gets older and it may not....some do ...some don't. But it is nothing to really worry about from the picture I see of your dog, which is a real cutie, by the way.