Extensions beyond 55 in the past have resulted in frozen seniority and/or being moved onto freighter terms and even being placed at the bottom of the list. To point out the obvious, extending and maintaining seniority affects EVERYONE!! From career progression, career earnings with delayed upgrades stretching on years to being disadvantaged when it comes to type transfers, base slots, roster requests and leave allocation.
Time to WAKE UP and make some noise, general apathy which seems to have manifested itself is not going to help. Express your dissatisfaction to the company and the AOA. Ramifications for your careers are huge.
Extensions won't go away, they're a direct result of crew shortages and training limitations, but need to be made with due respect to the seniority system, as they were in the past.