I just want to point out to anyone reading that currently has low SP this is also good for you, because it means the people that have larger votes are more likely to stay in the pool meaning the total SP of the pool will probably increase more over time and any disadvantage you have now will balance against the increasing power of shadow casters in general. Worrying too much about immediate benefits at the cost of high SP accounts leaving the pool is not good in the long run, because having a higher percentage of a lower pool size is not actually an advantage regardless of what immediate effects you see. This kind of scenario can be deceptive because people with high SP leaving the pool is not something you ever noticed before, right? When someone joined with 1000SP, stayed for a week or two and left, did you even consider it? Or do you focus more on how many votes your post got from shadow casters rather than who is no longer voting at all.

The thing is, there have been 1500+ signups but there are only about 900 shadow casters, which shows that many people leave after some time. I am willing to bet the people with most SP are the ones most critical of any problems they happen to find and most likely to leave if they feel like it's not worth their voting, so if this change alters the rate of high SP holders leaving the pool then everyone will grow more because of it, except that will not be immediately seen because it's something that happens over time.

This kind of change takes time to have a real impact, but I predict it results in higher overall power in the pool from better retention for people that already have SP, better incentive for people that have SP to join in the first place, and more people that already joined wanting to power up. This is a step in the right direction.