Improvement in T&Cs is due in two situations - whenever the company needs to attract new employees (by convincing them to quit their jobs in other companies) and whenever retention of the present employees becomes problematic (obviously because there are other, better opportunities out there and people are moving onto them in large numbers).
Which of those is the case now? Neither, unfortunately. Therefore, any improvement is off the cards until numerous other opportunities come up, absorb most of those thousands on the dole or in low-paid non-flying jobs now and provide better alternatives for present employees. As things stand now, those who still have their jobs will be clinging onto them for dear life and those who are out of jobs will sign up for literally everything. Not exactly an environment conductive to pay increase.