Not coming from a DSLR background I find the form factor and versatility of my "prosumer" camcorder to do what I need.
I would never remotely want the issues associated with a camera as mentioned in this and other articles.
I'm sure people are getting great results from these new cameras, a friend is very pleased with his GH4 in a Nauticam housing but after shooting side by side I was much happier with my video.
For me it is just far more versatile. It is too bad there is not more support for the mid range camcorders from housing manufactures.