It will never happen
There is a major flaw in the idea of a massive fragile object loose in the air.
Today is placid. Look out of the window and imagine an artificial cloud delicately passing by.
The forces on large buildings are significant, requiring a lot of steel for security. Multiply the slab side by a hundred and calculate the structure needed for security in all weathers.
Consider the stresses when we get a force 7.
Recall pictures of British Airways fleet on the parked at Heathrow recently. What will happen if a fleet of airships is grounded for any reason, which may be technical, financial or HR .
Hithertoo proposers explain that the machines will steer round storms. If only it were that easy. The machines have to reach their destinations and they have to come to earth. Is it proposed that at each stop there will be hangars for every one that might need it.
Hangers are called that because they were first erected so that blimps could hang safely in all weathers. Here are two at Cardington, note the scale.