R. Star wrote:
Except Worf was rescued by humans after the Khitomer massacre two years after Narendra III was destroyed. If tensions had already risen between the Klingon Empire and Federation, I doubt the USS Intrepid would've responded to the distress call. So very likely the four year old Worf would've been left for dead among the debris.
The thing is, I'm not sure Khitomer would have happened in this timeline. For all we know, the Romulans attacked Khitomer because their attack on Narendra III was foiled by Enterprise
. Rumor has it they attacked because they were concerned about a secret Klingon weapons depot (unsupported by canon). If they were successful in finding and destroying the depot, they may not have needed to attack the Khitomer outpost two years later.