Most people think the change to Tri Focus isn't really necessary because of its short radius. What most people I talked to told me is they would like the heavy attack to be interruptible. Heavy attacks are easy to counter for wardens and templars or anyone who runs a cleanse in some form or another. Not everyone has one. Leave staff as it was and reduce Tri Focus damage to 25%/50%.
Another suggestion this one for the recent changes; is to increase the radius of the last tic to mele range so that it actually hits something or shorten the heavy attack duration so that you lose 1 damage tic. Its a channel and you cant be doing anything else during that time and if you dont complete the heavy attack then for AOE damage its useless in many situations; making it not viable anymore regardless of the changes to ancient knowledge.
I feel this change will make ESO lose casual players more then anything else.