There are an estimated four million virus species. Only a relative few are able to infect humans. And an even smaller group are dangerous to human life. So the statistical likelihood of any group of newly discovered viruses being annoying to humans is miniscule. And the odds that one might kill you is vanishingly small, more or less equivalent to zero.
Now if one new virus is discovered in any human population, it is more likely to be infectious to all humans, but the danger to any individual is insignificant .
Can of worms time: Flu viruses kill millions of Americans every year. Our vaccines are not perfect, but if the shot only protects one in a dozen who get inoculated, thousands, even hundreds of thousands could be saved.
Hold off on fear of new novel viruses and take common sense precautions against the ones we know.