This is to prevent a late game issue where a lack of potential revolter nations hurts gameplay by giving the player no way to cut their competitors down to side other than outright conquest. Realistically Ireland would have cores on Ireland and Hindustan would have cores in India. For cultural unions there should be some prerequisites to a revolt such as owning X percent of that nations cores and not being within the same culture group. I feel this would make the late game more engaging by letting nations which are unlikely to be formed by the AI come into existence via revolution against a foreign power. Also cultural union cores should work like primary nation cores: if the core is located on a province of that culture group it is permanent.
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