Isn't land sinking something to address locally where it happens, compared to water rising which we're gonna need some sort of global solution for, as it's not just because of one country? If so, one would seem more difficult than the other.
Also, in some places land is actually rising.
Problem is the sinking isn't really something you can address in this particular case. It's a river delta that is compressing itself. But it's not only this, its land loss due to oil and natural gas practices, oh and its rising sea levels too.
Tl;dr they are screwed.