I would agree with those above who indicate you should not let fear dictate your life and that the ride to the dive site was far more dangerous than buring off a few hundred psi of air in shallow water after your wife got out - as long as you did not leave her in a back zip dry suit in 90 degree air temps. (And don't forget the homicide that could result from the angry and overheated spouse finding those love letters to the babysitter in the glovebox.)
There will always involve some risk and yes, there is always a risk of getting tangled in something while solo. But if you dive in limited visibility you need to be prepared to deal with that solo anyway as in 10 ft visibility, a few seconds and a couple of fin strokes by the buddy is all it takes for them to lose you after you become entangled.
Diving is an adjustable risk sport so you need to decide for yourself what constitutes and acceptable level of risk.
There will always involve some risk and yes, there is always a risk of getting tangled in something while solo. But if you dive in limited visibility you need to be prepared to deal with that solo anyway as in 10 ft visibility, a few seconds and a couple of fin strokes by the buddy is all it takes for them to lose you after you become entangled.
Diving is an adjustable risk sport so you need to decide for yourself what constitutes and acceptable level of risk.