I think we need to see actual numbers and a specific curve before we can judge this. There will be some cases where small interactions are inhibited but there are already some cases where small accounts can't by themselves generate a reward large enough to actually pay out. These are all tradeoffs.

One thing to consider is that if massive reward-mining operations are curtailed even somewhat, there will be a lot more Steem left in the reward pool and the sorts of small interactions you describe may therefore generate larger rewards, despite being somewhat inhibited by a curve. There are two parts of any reward calculation, one being the curve and the other being the total size of the reward pool and what else is pulling from it.