That I've seen, the "2030" was an estimate of when the forward hull section would completely collapse.
Underwater or not - the forward hull is a tall metal structure, weighing thousands of tons. At some point, corrosion of the load-bearing elements will weaken it too far to withstand gravity and currents. There will be a major collapse, with (my guess) the decks mostly pancaking, and a fair amount of the sides being blown outward. Along with a huge amount of "little stuff" from inside.
Underwater or not - the forward hull is a tall metal structure, weighing thousands of tons. At some point, corrosion of the load-bearing elements will weaken it too far to withstand gravity and currents. There will be a major collapse, with (my guess) the decks mostly pancaking, and a fair amount of the sides being blown outward. Along with a huge amount of "little stuff" from inside.