One thing to note from /u/spez's announcement of the changes[1], which suggests the impact might not actually be that large:

Interestingly enough, r/the_donald was already getting downvoted out of r/all yesterday morning before we made any changes. It seems the rest of the Reddit community had had enough. Ironically, r/EnoughTrumpSpam was hit harder than any other community when we rolled out the changes. That’s Reddit for you. ¯\_(ツ)_/¯

[1]: https://www.reddit.com/r/announcements/comments/4oedco/lets_...