Assuming the CFR remains stable. Most new infectious diseases rapidly drop in mortality because of natural selection: those variants of the virus that make people sickest result in their hosts not surviving or not coming into contact with other people to spread the virus, so the strain that becomes endemic tends to become less virulent and more adapted to its host. This has happened with leprosy, syphilis, HIV, and Ebola, and there's no reason to believe it wouldn't happen with nCOV (if the outbreak isn't contained entirely, as SARS was).
It's highly unlikely that those ambulances are related to the virus. There are 0 confirmed cases in Northern Ireland, and if it was a suspected case the government and media would be all over it to find people who were potentially infected.
