Yes
Blackcrowned was created in 1920-09.
Ascension Night Heron was created in 2003.
Mauritius Night Heron was created in 1893.
Rodrigues Night Heron was created in 1874.
Japanese Night Heron was created in 1836.
Réunion Night Heron was created in 1907.
Bermuda Night Heron was created in 2006.
Niue Night Heron was created in 2000.
Yes, many different kinds of herons are becoming or already are endangered.
Bonin Nankeen Night Heron was created in 1839.
There are many different species of Herons. I didn't find any of them listed on the Endangered Species List (US Fish and WildLife Services). Some specific species are listed by individual states as threatened or endangered. As to the general populations of all Herons facing extinction, I can find no evidence to support such a statement. The White-Bellied Heron, and the White-Eared Night Heron, are listed as endangerd, but I found no forecast for their extinction.