£7M loss, per day, is clearly a blow to British Airways, as it could well use that money for more positive uses.
There is a also horrendous brand damage, particularly abroad.
But I can't see how the union can claim victory if the operation continues.
If the union announces more strikes, I fear for the airline in the short term, as it will polarise the cabin crew even more (making post strike relationships difficult), bleed the company of money that is needed for other things and get more people into the habit of booking with alternative carriers.
On the other hand, I also believe that a compromise would be a disaster, as the airline does need to be allowed to manage it's business (lawfully) in a world very different to the days it emegerged from the union of BEA/BOAC.
From a negotiating perspective, it is now difficult as positions appear to be dominating, as opposed to interests.
When interests are the driver, it is often possible to manouevre into a position that resolves the matter.
On the other hand, positions are like trenches.
So we will see what happens.