Despite the earlier two Coronavirus outbreaks, this appearance of the third Coronavirus outbreak has brought several complications and now emerged as a human-health related pandemic issue. The wide geographical spread and transmissibility of newly emerged novel-Coronavirus (2019-nCoV) and severity of coronavirus disease 2019 (COVID-19) raised serious concerns about the future trajectory of the 2019-nCoV/COVID-19 outbreak. Herein, we have briefly covered some important aspects of the 2019-nCoV/COVID-19 outbreak to highlight the need to learn lessons for a safer future. First, an epidemiological comparison of respiratory viral infections with particular reference to 2019-nCoV is given with relevant examples. Following that, considering the earlier two Coronavirus outbreaks, the emergence of another new 2019-nCoV is given. Finally, the lesson learned, so far, and key concerns for pandemic impact assessment at large and COVID-19, in particular, are discussed for future considerations.