Good to see overall acxeptance rate is rising. The only drawback for this is probably all the contributor might get lower reward while @utopian voting weight remains the same to vote increased number of posts.
But all in all, such trend is good to see.
This will happen yes, but the machine stops voting at a certain vote power % and continues when back at 100%. It is something to watch down the line, and something the contributor must consider - is it worth the time or not.
Cheers!