Creation of what is, in effect, a B scale may one day prove to be very divisive amongst the pilots. Twenty years from now some of you may be looking forward to retiring on a nice final salary.
Then you're told that the the fund cannot support it and can only service those who have retired, leaving you to retire on less than you expected. What sort of support/sympathy do you expect from the B scale guys for industrial action? You reap what you sow.