They've finally cottoned on to the fact they are being exploited.
Another outbreak of BASSA-mentalism is unlikely to succeed, the whole point of Mixed Fleet is to keep turnover higher than it was to ensure a better mix of young and enthusiastic over old(er) and well paid. Competitors like Laker and Virgin saw Cabin Crew as easily replaceable, in order to compete BA did have to slash costs.
Unless BA are not holding up their end of the contract, it's misleading to claim they're being exploited, unhappy at the hours and rates one has joined is not the same thing at all.