Lowering the limit from 4 hours to 2 hours was great. But the rest shouldn't have been changed. Now, when you, as a group, kill pirates, they're free to attack anyone who didn't get a blue message on them.
It should have stayed as before -- Can't enter the system (but for the new 2-hour limit, not 4-hour), unless granted permission by the person that killed you. I grant people permission very often when it is appropriate, even if they don't ask, I'll just send them a PM letting them know I'll let them come back, after I myself have left the system instead.