How do you determine 'still' in a universe where so much time travel happens?
The Master is alive near the very end of the universe, and I'm sure he visited the very start of the universe (or close to it) at some point.
Even if his last incarnation is deceased, and he will make no further actions, his past incarnations still exist at every point in time they visited.
Unfortunately, I haven't seen all the new series (I didn't see the end of Tennant's run) so I can't comment on the Temporal Loop.
That said, unless this has done something to prevent the Doctor from travelling in time, he could always run into a past version of the Master, interact with him, and potentially change the Master's future... which would potentially change the Doctor's past.
And now I've gone cross-eyed.
EDIT: Now that I have watched through the end of Tennant's run, I can safely say: The Master is dead and so are all the others, including the planet of Gallifrey. They all died at the end of the Time War. The Time Lord's actions on that episode almost brought them all back from the dead, but didn't. They're dead, and never coming back.
Until another episode gives them a way back, that is.