Seems logical to me. First I thought this might make it hard for people who are just here for curating and don't want to write themselves too much. But those people can earn Reputation based on their comment so that doesn't seem to be an issue.
Seeing some troll/useless posts getting upvoted way too high and some others getting flagged for no apparent reason, this might really be a big improvement if people who expose themselves as bad curators could be stopped.
On the other hand this might become an issue if whales decide to "go to war" with each other for their personal interest. A group of a few whales might be enough to demolish another whale just because they've got reputation and steempower. Currently this whale might still at least be able to have an impact on the network. With your suggestion even that wouldn't be possible anymore.
This is also true, but there is a way to fix this also, as I have proposed.