No, iDevices are too popular for USB to be a Lightning killer. Instead, it and Lightning are consumer "just works" ubiquity killers. One ubiquitous standard that "just works" just fine gets fractured into 3 jacks. Everyone that desires a ready ability to connect one set of wired headphones to pretty much anything must deal with at least 2 adapters, 3 wires each terminating in a different jack type, or maybe one wire with multiple jack types at the end (can you say ugly and probably easily damaged going in & out of pockets?).
The killer is in the consumer aggravation to make this choice to fragment "just work" for all situations. And it will be a hassle for at least several years except for those that can get every bit of their audio-listening experiences out of a narrow group of devices that all share any one of these connectors.