If my analysis is correct, the main issue about this subject is that people are asking directly for ACES support out of the box.
Given the way blender handles OCIO currently, any effort in this direction would probably be a waste of time.
What is needed and what people need to ask for or provide help for is a proper OCIO (V2?) support which would make using ACES trivial.
However, this seems like a huge undertaking that very few devs could tackle.