Consequences
The consequences for shipping could depend on how Titanic survives. If she avoids the iceberg altogether--no change on shipping construction, no international cooperation on detecting and avoiding icebergs, etc until the next high profile catastrophe.
If the lookout is less alert, and the ship plows head-on into the iceberg at full speed, I'd expect some of the same changes as in OTL. Titanic limps into port, her bow crushed, with numerous dead and injured, but still afloat. The captain and lookout are toast. More work is done on avoiding icebergs, much as in OTL. What doesn't happen is the changes in safety requirements for getting off a sinking ship--so subsequent disasters are more severe.
Incidnetly, Titanic herself may not get many passengers after such a disasterous maiden voyage.