I would submit that what is more important is not providing funeral directors with more business.
People are contagious for several days before symptoms appear. Among the elderly and those with compromised immune systems, death can, and has occurred within hours of the onset of symptoms.
God gave us the Eucharist as the greatest of gifts. Not all can receive this gifts - only Catholics in a state of grace.
God also gave us common sense; and reality teaches us that not all appear to have it or be able to exercise it.
We have no clue at this time as to how many people are actually infected, in part because symptoms do not appear for days, and in part because those who are healthy and in particular the young may show no symptoms, or such mild ones they do not recognize they are infected.
If the bishop or the archbishop of a diocese shuts down Masses or severely limits the number who may attend, and an SSPX chapel refuses to comply, they show their unwillingness to follow legitimate authority. In doing so, they risk not only the passing of infection among their laity, but also risk those who might be infected in turn infecting others who are not part of that group. The real world statistics is that the infection doubles every 6.2 days, which is far more volatile than the regular flu.
Our earthly existence is not endangered by the withdrawl of Mass. Japanese Catholics went @ 200 years without a priest an maintained the faith.