Personally, I dont worry too much about that sort of stuff. It's all part of an instrument being played IMHO. I don't mind wear as long as it isn't abuse. I like to keep my instruments in good repair, and looking the best they can, but I don't let myself worry about the looks of being a played instrument. However, that's me, and many do like to keep their new looking, and there's nothing wrong with that.
That being said, look into a low tack film. You can find films in matt, or gloss finsih, and can be cut to suit just about any flat surface. It is barely noticeable if applied correctly. It can also be removed when ya want to remove it without damaging the finish, or leaving adheasive on the finish. It is basically the same type of films they put on new automobiles for shipment to protect the finish from skuffs and bumps of transporting from the factory (except most of that film is white). But those types of films can be found in clear as well. I know some that have used the low tack window films. It just peels off if ya want it off, or stays put. When ya play it, any wear on the instrument will happen to the film, and when it gets bad enough to bother you, you just peel it off and replace the film with new. I have known guys (and gals) use it on pick guards which is virtually invisable, or even cut small patches and applied to areas where they tend to wear a finsih (typically on the upper edges of the lower bout typically rubbed raw from your fore arm. I even known people to put in on their necks to protect the finish there.
In the meantime, i will see if I can find some, because it is not nessisarliy marketed "for" the purpose of guitar/uke protection, but commonly used in the guitar circles I think. It does protect the re-sell value of your instrument if you plan to re-sell at some point in the future.
