Are you diving wet in NY state in doubles? As I described earlier, its almost impossible to not be able to swim up a single tank in any wetsuit (even 7mm) from recreational depths ~100ft. If you can swim it up, you don't need a redundant bladder.
I would not advise a single tank below recreational depths.
If you are diving doubles, in a thick wetsuit, that would not be a good idea for more than just the redundant bladder issue.
Lots of people dive deeper than 100 ft with more than 1 tank without a drysuit. It may not be what GUE would recommend, but lots of people don't take GUE training and/or prefer to spend their limited hobby money on actual diving than to spend it buying gear that costs them 3-4 years worth of diving expenses so they could meet some GUE standards they're probably not aware of (having never done any GUE course).
A double bladder wing, and training on using it as redundant buoyancy, is considered a positive thing by many divers/diving organizations.
Many would argue that there are more failure points on most drysuits than there are on a second bladder in a wing. And "more things to fail" seems to be the only logical objection to a double wing I've seen in this thread so far.