To be honest, I don't know how this is going to be concluded. There are many things that have been predicted, but haven't happened:
a) Unite hasn't cut BASSA lose
b) BA hasn't "gone nuclear" and imposed an entirely new contract on crew
c) BASSA hasn't imploded (or at least we cannot say it has for definite)
d) The strikes did not collapse (BA may have been able to run the majority of services, but there was still a sizeable minority that went on strike)
As evidenced the numbers of crew voting no to the latest proposal, there is still a sizeable minority holding out, whether through personal determination or loyalty to BASSA.
There are so many unknowns at the moment (how many non union members accepted the offer, how many crew are still in BASSA etc).
Assuming BASSA manages to retain collective bargaining rights, if BA wants to put through contractual changes, it has to do that with BASSA and regardless of support for further strikes, I can't see BASSA conceding defeat and reaching agreement.