I'm sure there will be some tweaking, however I doubt that the developers are going to completely revert things. LagSlayer was in need of an update anyways and I feel like this new version addresses quite a few issues. I personally am using a terrain gen, and have had no issues with it, outside of absurdly low wait timers.
If you've encountered any bugs or issues with it then you can submit a bug report or edit your thread here and I'm sure a developer would be happy to take a look.