I love offline facilitation. It provides as well tons of value and, in some cases, it can make the participants many times more engaged compare to online. At the same time, online delivery can bring also some fun experiences. As an example, once I had delivered online training for students from Spain at 9am and all of them were wearing their pyjamas.
My opinion is that we can successfully use the two methods depending on the use case. I wouldn’t say that because one method exist the other is dead.