With 5 days aloft time, i could see a lucrative role as an alternative to (very polluting) cruises. We could see one of these pottering around the Nordic Fjords, for example. Beyond that, there is an increasingly popular slow travel movement - for example people choosing ever more to travel by coach than by train. Going by airship instead of by jet will have a heap of positives that may very well outweigh the negatives (speed).
And if it doesn't a large concrete expanse to land (i.e. a traditional airport) - that's a good thing too. Any reasonably accessible field (I can think of 3 or 4 locations within 3 miles of my desk) is suddenly a potential journey start point.
That's not to say that i think this idea will work or that these airships will ever be delivered. But I'm not sure I agree with some (most?) of the negativity above!