I've been reading this with some curious feelings... First of all, as one pointed out... in very few other matters, "Scubaboard" is oddly unanimous!
Secondly... Have you asked your wife? I don't know her experience, but your profile states 50-100 dives (Which is what I normally do from January to May...) If my guy had suggested this to me, I would have slapped him over the head and said "Get Real"!
The scenarios you are suggesting are the types that show up when you either don't make a plan, or you plan a dive that you are/or might not be proficient enough to do.
Plan your dives properly! Review divesite topography and possibility of current/silt. Revise your risk acceptance factor!!! (This is the biggest one for me...) If it looks gnarly... well don't do it...
And foremost... if your camera is the problem you can't stay together, either communicate better on land and make a better plan, or ditch the camera.