Changes are coming and that's the best time to get your best new (or old) ideas on the table to the devs. The wishlists stickied are a bit old and I will review them and put them in here, until then let's throw more in there if you have them. I will attempt to 'lump' all your ideas into themes and list the ideas under them.
1. Damage mitigation - Mainly for endgame encounters. Ideas here include massive AC's which have noticeable effect on mob damage, reworked layers or % based damage reduction.