Originally Posted by Oswin Oswald:
“Given that the raison d'etre of Clara's echoes is to intervene when the Doctor is in danger, counter-balancing the Great Intelligence's malign interventions throughout the Doctor's timestream, this surely presents an ideal opportunity for the return of Clara in the form of one of her echoes. The original Clara may still of course return, before returning to her final moment in Trap Street. But Clara's echoes would seem to present a more varied and longer term opportunity for Clara to return : more varied as her echoes can have different personas whilst still essentially being 'Clara' (eg Oswin vs Victorian Clara); and longer term as her echoes will always be around while the Doctor is, ie throughout his whole new regeneration cycle.
Would there be a paradox created if the original Clara encountered one of her echoes? Perhaps that could be the basis for a new story...”
You may not have noticed, but such was the nonsensical nature of the impossible girl explanation of the Clara echoes, that even Moffat seemed to be embarassed and abandon it thereafter, choosing never again to mention the echoes even though he could have. I doubt therefore, any possible return of Clara would be anything other than the real Clara.
If they wanted to bring Clara back, they've already set it up to do so easily with little explanation with her flying around in her own TARDIS.
Besides, in my opinion, Time of the doctor wiped out the events of name of the doctor and the Clara echoes now never happened.
Also, why would Clara need to be brought back so soon? some people complain about the amount of Rose but she only did 2 series originally, and there was at least an entire series gap without her before her return. Clara has already been in 2 and a half series, not to mention being the main companion in the 50th and featuring in no less than three Christmas specials. If Clara returns in series 10, it would say to me that Moffat has become a bit too obsessed with the character. A mention is one thing, but a return so soon, after she already had a few 'almost' exits already would be quite another.
As someone who has no particular love for the character, I'd like to think we are done with her. I'm not convinced we are but i'd like to think so.