Well a dataset which can't be manipulated to fit your opinion will do wonders for the world, we still have people who think earth is flat, imagine verifying every single step through block chain. There will be no more doubting science, things will become transparent in my opinion. Imagine an AI running on a block chain, its code can't be corrupted by a single evil person this will make public more comfortable imo. Every decision the AI takes can be recorded on to the blockchain etc the possibilities are endless with AI and blockchain working together.
Well the datasets users would have to feed in or the parameters for data collection by an AI would still be exposed to initial bias, though of course, if it were all transparent, others would be able to rank objectiveness and propose add ons or adjustments to improve that.
I see verification of identity, as well as compliance, that already use big data, machine learning and deep learning, as potential candidates for blockchain innovation. In the sense that immutability... proof of work or other cryptographic algorithm can help secure data against intrusion and alteration.