It does make for an interesting bit of maritime lore, and potentially a business scandal of substantial proportions, however the name on the side of the ship still doesn't diminish the scope of the disaster after the fact. If the ship was intentionally steamed into an iceberg the only thing that really changes is our modern perception of the cause of the disaster, everything after the ship struck ice remains unchanged.
If a company did indeed intentionally switch and scuttle a broken ship to claim the insurance money, then the conscious must have been quite heavy on the decision makers that crafted and executed the plan. Personally I would wonder why engineer an iceberg strike when a boiler explosion would have been much more easy to control and doubly effective, it could have been done just close enough to safety to endanger far fewer people. Even using a coal torpedo could have placed blame of sabotage on the coal labor strikes or some foreign entity.
However trying to prove and disprove conspiracy theories is like trying to capture smoke, rather than putting out the fire.