Why doesn't it count? GP asked for an example where post-Job Apple made something mainstream, and the AirPod basically made TWS earbuds and removing jack mainstream (while not necessarily benefits end users). There are gazillion TWS earbuds now ranging from $2 AliExpress special to $400 from audiophile brands, that should count as mainstream.
Whether Apple can make VR headset mainstream or not, that remains to be seen.