I have this theory incoporated in a fic of mine but it’ll take years to finish so I’m just going to blurt it out now. I think that the Doctor’s name will be the key that unlocks the Last Great Time War, which was ‘timelocked’. Like somehow the memory of his name will be enough to open the rift at the heart of the Medusa Cascade and all the horrible stuff from the war will just pour out and consume the universe, if the scumbag Timelords didn’t turn everyone to primordial soup first. This is why the Doctor’s name must never be spoken, this is why the Doctor will cause the universe to end, and why silence must fall.
Also, am I the only one who can’t stop thinking of Donna? I mean her memories of the Doctor are only merely sealed, not fully wiped away. So shouldn’t she also remember the Doctor’s name?
If this theory turns out to be true remember, you heard it here first ;D