This certainly opens up a whole lot of land in China, and Korea (North and South) to develop tidal marshes and estuary land.
with some joined up thinking there could be an amazing leap forward in developed coastline. With the type of stone walls used along the coastline in the Scottish highlands, they are built with open spaces to allow the sea to pass through them, not to push them over. Then perhaps the importation of sheep that forage the shoreline from France and Scotland, the foreshore could be used for grazing of seaweeds, With reed beds and sedge grasses as a natural filter behind the wall, a good breeding for wildfowl.
I assume the sheep would be OK up to the mid 30 Celsius. Ducks and geese are happy.
salt fed sheep are delicious and they also have wool. So they could contribute to textiles. Wool makes excellent house insulation too.
With the byproduct of desalinated water from hydrogen production at seaside locations and no pollution, the water could be used for diluting the seawater in the paddy fields.
I do like some joined up thinking. People need feeding, and modern farming is very technical. However using natural ecology to do the job is also exciting.
There are many seaweeds that are edible and tasty. The whole plan would be to regenerate the coastlines, get rid of pollution, and test the water quality for typhoid and cholera type organisms.