As presently formulated, ICE's Bitcoin futures market sounds like a bad idea. They are not even creating a separate clearing house. This sort of sloppy risk management is how cryptocurrency could take out the legacy financial system.
Traders, I get that you want to play in cryptocurrency. That's great, and you are welcome, but please do so responsibly. How do you handle forks? What if some cryptography breaks? You should have solid answers before standing up new markets, and I'd have to assume that good answers would involve specialized clearing houses.
Sure, maybe one day Bitcoin will be the global reserve currency. Or, maybe it will suddenly drop to $0, due to a surprise cryptanalytic result. That surprise cryptanalytic result could come tomorrow, for all anyone knows. If that happens we will need our large institutions to survive, so make sure you can. CFTC, please make sure they can, ICE has a conflict of interest without your oversight.
Core devs, be mindful of what ICE is doing, and try to code accordingly.