Thank you Max, it has been really useful and hope there are ways for trusted coordinators to come back in the future. 
If in the future multiple nodes (with additional opt-in open source coordinator software) could come together to form a decentralised honest coodinator over tor.... The coordinator function would no longer be able to be taken down and has no fixed location and would no longer require trust. 
Or have miners listening to coinjoin requests, for a certain fee to coordinate it in their next to be mined blocks (in their own mempool)