Adding player faces is a nice idea. It would increase the traffc (between the servers and the customer devices), but it adds a value for sure and it is not difficult to program. And Nordeus could add some token spending features, like uploading an individual player face for some tokens. ;-)
A 3D topeleven is indeed not so easy to realize as far as I understand what you mean (3D grahic feastures similar to football manager games on PC or console). One issue are techincal difficulties and another is the effort to conceptize and realize 3D features in a football manager flash game. As long as there is no competitor that provides such features or they are highly demanded by the fanbase topeleven will probably not touch this risky project.
My two cents. ;-)