This is nothing more than a storm in a teacup and it will be forgotten soon enough. This is not the first time that BA Mixed Fleet crew have engaged in industrial action and I doubt it will be the last.
The fact that it's business as usual for cabin crew on the legacy (Eurofleet and Worldwide) contracts as well as witnessing pilots volunteering to work as cabin crew in past episodes of industrial action, highlights that there is little solidarity amongst crew in BA, never mind elsewhere.