Can we all just wait a second?
Riot has made it clear through various posts that they will be hitting marksmen and fighters in 8.10/8.11 and that 8.8 and 8.9 are meant to be in preparation for it. I don't know if the nerfs will ruin mages or not, but neither do you. I'm just asking you to wait until midseason roles around in May. It's really not the long to wait.