Well, you've got clan icons next to your name everywhere for common identification. Those should be more than enough of a substitute as far as "clan pride" goes.
And clan tags should never be the core of your clan's common identity. That position should be going to games and tournaments.
Having a clan tag is also redundant (And thus makes you look like a retard) now that the icons are here.
I know all too well. I have the TJC icon, so it's obvious what clan I'm in. But I can't get rid of the TJC tag in my name until level 57 or something. :/