Coffee could go extinct and our generation would just have nostalgic idle chats about it here and there, but nothing would really change. Kids who never drank coffee would grow up and never think about it, much less care. Bangladesh could completely sink tomorrow, and you'd have people 15 years from now saying it's all some grand conspiracy and Bangladesh never really existed. You'd just have people saying climate never changed and taking family trips to the beach would be a good way to cool off on those hot Nunavut February nights.
People just kind of adapt to whatever's happening around them. No matter how crazy or awful it is, people just get apathetic after a while. And so long as someone has financial motivations to push the idea that this is normal, people will keep thinking it is and they'll forget just how much things changed.