Unfortunately the cancellation of E3 2020 has been inevitable due to the rapid spread of the coronavirus in multiple territories around the world.
This has generated a great debate in the communities and the companies have decided to speak out to express their support for this decision, including Nintendo
This has been stated by a company representative in this regard:
We will continue to be flexible and redirect our efforts to other ways to keep our fans updated on our activities and products. Due to the COVID-19 outbreak, major events in the industry may be unsustainable for the foreseeable future. But we are considering various ways to connect with our fans and we will have more to share as the year progresses.
Via.