Has there been any evidence that all of these 6,000 'volunteers', et al actually exist?
WW would claim such numbers, wouldn't he, in an attempt to de-stabilise industrial action.
Even if he DOES render strike action ineffective, he will make BA a pretty poor career choice in the future - unless the BA employee of the future accepts that they will be shoved into whatever position the company chooses - all because this is how it has got its way in the past.