I've been somewhat of a solo diver for over 11 years now. As I stated in my previous post, I do make sure that I have enough redundancy in my critical gear. If the dive requires a secondary, I bring a tertiary. I've really never had the opportunity to have a full time buddy, as my significant others(wife, kids, close friends) throughout the years didn't dive, and you can't really call someone you meet on a cattleboat a real buddy. I've spent more time on those dives trying to keep my "buddy" up off the bottom, trying to stop them from grabbing everything they see for balance, or kicking over soft corals than I did actually enjoying the dive for myself.
It would be nice to have a buddy around to go with, and I've found some here on the board, but they live between 3 and 8 hours away. There are a couple of local guys here I used to dive with, but three divers in the water, one with a camera, and two with spearguns doesn't make a good team.
There are also alot of divers that I've known that dive in areas that are considered "diving by braille" in brackish waters. Not sure how that works out depending on someone else in those conditions, other than a jon line, and signals through little tugs on the line (one HUGE tug means either "GET OVER HERE NOW" or I've just been eaten by an alligator, and you now have a new dive buddy <grin>)
Anyway, that's my .02 on this topic, and if anything ever does happen to take me out of the game, I'll be sure to post here when it does.
Dive safe, and have fun