Yes, that's my theory too...if there's 2000 years allowed for man and if it starts as the death of Christ then you're right, there's not much time left. Because of calendar changes I personally believe he was born in 4 BC. If he died at 33 years old then we have until the year 2029 or thereabouts.
I am expecting the man of sin to be revealed by late Fall of 2017, with a false pact bringing supposed peace to Jerusalem. But then I believe the Rapture will happen sometime between right now ... and the late Fall of 2017.