Tsunamis in Sendai

According to the news, there is an old document that indicates the Sendai Plains were devastated by a similar big tsunami in 9th July, 869. A professor has found trace of the big tsunami in earlier times, and it is clear from geological surveys that the big tsunami hit the Sendai Plains about 2000 years ago as well. That means that such an event happens once every thousand years.

In a thousand years time, none of us will be here. In the distant future, I wonder how different the coastline will appear?