There have been rumours about the state of the airline for at least three months in the UK, witness endless sales of seats, reduced fares and free car hire as incentives to book. The largest insurer against airline failure has refused to offer any further cover, the second largest is considering it's position at the moment. The largest buyer of this insurance is the travel industry itself, if they consider that they have to carry the risk of failure, they tend to simply stop making bookings, most travel agents had stopped selling Silverjet long before its failure.
As regards the EU Regulations, Zoom will no doubt say it is based in Canada and as such it only has to comply with the Regulations when departing from the EU, they have no liability ex-Canada.
I hope they do survive but in the travel industry, rumour alone can push businesses over the edge