Titanic would still be gone. Perhaps sunk during WWI, Scrapped like the Olympic during the '30's, but still gone. If Titanic HAD survived the iceberg impact (head-on or otherwise), she'd have been repaired and continued serving the sea lanes until they were done with her. And since she WOULDN'T have sunk, taking 1,500 people with her, there wouldn't be even a quarter of the attention focused on her. She'd just be another ship that went through a bygone time.