I like your idea – it’s a new of thinking to use of the airship technology. Together with a mate from architecture school 2 years ago we designed an airship fueled by solar cells to transport wind turbines.
http://rum1.aarch.dk/index.php?id=106915

The Russians among have something going..
http://www.marchmontnews.com/story.php?story_id=12554&story=LocomoSky-puts-$660m-into-hot-air
http://www.locomosky.ru/en/

Are developing more on the project?

To stop, ground transports grab onto the moving parts, and friction does the rest. A floater needs to reverse thrust; you will be putting out nearly the same power to stop as to start, minus air drag. This means an airship is a terrible start/stop vehicle.
Once you stop it, where do you put it? The “alien bus stop tower” design looks cool, but you would need to level a city block or two to build it, and clear out all the tall buildings on the approach and the eggres corridor.

This design creates major problems, is based on tech that doesn’t pencil out, and solves no dilemma for the urban commuter that is not better addressed by the humble bus.

Still it is a good idea as it is substantially cheaper than a metro and it is something you adapt to your needs from city to city. However I would think of it mostly a solution to link different cities to more remote areas, not suburbia and city centers.

Sprawl tends to follow transportation, not vice versa (note: TENDS TO; there are exceptions, they do not disprove the general trend.) With the kind of transportation afforded by airships, it would be desirable to build arcologies, starting small and getting bigger. Right now, building low makes sense because transportation is on the ground. Put your transportation in the air, it becomes easier to build high, to leave the land for other uses.

One of the myriad hidden burdens of the current infrastructure of roads and cars and trucks and gas stations and (shudder) is the need for continuous maintenance. Within 10 years, unmaintained roads are almost invisible ruins. Already, there exists major technology to strip off old concrete and recycle it to create newer roads. So the well-developed road network of the industrial west is more like a Tibetan butter sculpture than perhaps we choose to imagine.

Connect major shopping malls with their acres of parking lots and existing platforms (roofs) with transport airships. Minimal infrastructure will be needed. As the trend becomes popular, I can see communities where the dwellings are in a high-rise building surrounded by parks and golf-courses, connected to shopping and entertainment via Airship. As the trend continues, It is possible that the obsolete roads get pulled up and their material recycled into more dwellings.

When dwellings can go anywhere, farmland tends to revert to what it should be, forests and prairies become assets again, and dwellings start to appear where the living is better, or where the scenery is more interesting.

But, the idea is not all that new. The top of the Empire State building was designed with an incorporated Airship dock.

Hydrogen is flammable, yes-in-deedy. So why do we allow ourselves to speed about carrying tanks of Gasoline? Besides, of all the Airship passenger miles in the 1930s, Airships are still safer than Aircraft, and only once was fire a problem. Most airships were lost to high winds causing the tails to fail.

I like it a lot.