This is a good thing. This helps move WoW away from the "Everyone is a winner" concept they have taken. People will actually have to start thinking again.
As for the change killing boosting, I don't think it will for the reasons mentioned above. Just change from spamming it to pulling more mobs at one time. With the increase in stats this shouldn't be a problem even for a newly dinged 80+ toon in quest gear.
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