While the wolves, cougars & coyotes may well have had an impact on the herd. Most of it can be contributed to WDFW's generosity of special permits to rifle, muzzle loaders & archery and senior citizens. Then throw in the fact they didn't want to feed the deer after the wildfires so they decided to hand out doe permits like their candy. You have people out there killing pregnant does and expect it to come back. You cannot kill off the breeding future of the herd and not expect it to suffer. 
hahaha.... there are no Archery methow permits. I wish there was id add em to my list