And retroactively downgrade everybody's i90 gear to i80? Yeah, that'd piss off the majority of players.

Crystal tower was originally supposed to be out at release. Due to imbalances / broken aspects of the dungeon, they had to delay it till 2.1. Screwing over people who did coil by downgrading all the gear they've been accumulating for months (with a lock out per week) is not the way to go. I know if I had more than 2-3 coil drops I'd quit the game over such a thing happening.