I'm pretty sure the largest amount of complaints from players would be in Random Battlegrounds, not Arena. While I noticed lots of bots in arena in 0-2k rating, they are all easy to beat if they don't know how to position themselves, use CDs properly, how to counter certain things and chain CCs. The ones that do know these things you rarely notice botting behaviour from, because you assume they're good enough to do what the bot does. The CRs used in arena wont work above 1750 rating if you've got everything on automatic. Most things you'll have to control entirely on your own, basically only using the rotation of the CR.
The only exception is instant interrupt and possibly those 0.2 second spell reflects from Warriors.
In random battlegrounds, however, you can see a bot train of 20+ people ruining the gameplay for everyone else in it because they are such an overwhelming majority in that aspect of the game.
Either way I'd say this decision is the HB team grasping at straws because they seemingly don't understand how their software was detected, all they've done so far is speculate(?). So we're to be thrown at the hope of Blizzard turning a blind eye to the continuation of massive botting by sacrificing Honorbuddys PvP oriented customers. Again I speculate that this will have no effect on Blizzards future decisions about doing banwaves targeted at Honorbuddy again, and again, and again until the real issue has been resolved (whatever that may be).
Time will tell. I wont sink anymore money into this whichever way it goes.
