Buoyancy problems aside, there is another major problem with drysuit failure, especially if the failure happens late in the dive. Being cold during deco and warm during ongassing can up your risk of getting bent significantly. I had a friend who got bent when they blew out their dry suit near the end of a long dive at Ginnie.
On the plus side, this was the justification in used for buying a heated vest...All in the name of safety!
