The summary of our research findings is that, in general, IPFS performs worse than HTTP at content retrieval. This poor performance characteristics would probably be the reason why IPFS won't be explored as an alternative distribution mechanism within RPKI in the nearest future.
The report can be found here: https://homepages.staff.os3.nl/~delaat/rp/2019-2020/p95/report.pdf.
Comments, thoughts are welcome!