I think the dust reward will probably still be a factor since you need quite a bit of HP in order to give a $0.02 vote. Although this might be a lot easier when the price of HIVE increases.
I still upvote the comments on my own posts to give them 2nd layer tokens where there isn't any dust.
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I agree that the dust reward will still be there and a lot of people won't want to "waste" their voting power and not get any rewards. However I believe that slightly bigger players will use this option to reward engagement. I also use second layer tokens to reward comments on my posts but I think I will use hive much more when I and the commenter gets a reward!
!ENGAGE 20
ENGAGE tokens.