That's somehow true but sadly low chances to happen because of some reasons.
1. Top Eleven focus a lot on the quality of products and here I am talking about the design, letting everyone to upload his own emblem would automatically generate a lot of fail emblems.
2. Copyrights - You must be realist, a lot of people would start to upload pictures from the internet from which they do not have any rights.
3. Nobody would buy officials or premium as long they can just get others similar or even those much easier and much faster.
The thing is that Top Eleven provides hundred of possibilities from where you can choose, plenty enough to somehow please your taste but that's true, sometimes we want something that we feel that represent us, that give us something unique but because of the current format of the game is less likely something major to happen.
Personal I am a fan of the current system, I actually love it because somehow there is a certain standard of quality.
Is true that not all the emblems look nice but some of them are pretty cool but as I said above, there are some good defined lines about how emblems look. Just think that if they will allow everyone to upload their own, for them would be impossible to stay and approve them one by one, plus the huge amount of space they would need to store all the pictures from millions and millions of clubs and more then this, personal I think would be an epic fail, we would have to face teams with emblems like: pictures of Messi, pictures of Ronaldo, pictures of boobs, more pictures of boobs, Trump? , Hillary? , Chelsea?, pictures of cars because why not, etc, I guess you got my point.
The most Top Eleven can do I assume would be some new patterns, new symbols or a way to let you to add your own club name on the emblems but more then that I doubt it.
Just as you, I am a Top Eleven player and not an employee but trust me, if you somehow will manage to make a good impact to the game and help the Top Eleven community there would be a moment when they would gladly come to you and offer you your own emblem and to do honest I don't know how many companies will come on such a low level where they would offer such a great thing to a player, that's why for me from this point of view for me Nordeus is special.