I think that fixing ActiveRecord will take too much work, apart from all the code that is handled under the hood is difficult to do under the new version, I think that the ideal is to work directly with doctrine / orm and ensure a robust framework.
as @samdark said the new version accepts any abstraction whether it is doctrine, eloquent, or active-record of yii, I only comment that for the demo package version as it will not be available yii-active-record is done with doctrine / orm, while the active-record package is fixed.