Outside of gaming and industry use AR/VR have felt a little like a solution in search of a problem. I do believe though that the people who work at Apple are capable of solving that problem, finding the use cases that an every day person wants it for.
My benchmark for this is my family, they are all different, with different level of interest in tech. If I can see the majority of them having a use for it, being inspired by the UX and marketing, then it will be successful.
Until now none of them have any sort of VR kit, but they all have iPhones and Macs.
As a slight aside though, new hardware products are very hard for Apple to keep completely under wraps, too many people in the supply chain, too many factories. Software on the other hand they can lock down incredibly well (pun intended). I am somewhat suspicious that they may supprise us at WWDC with their take on generative AI. Now that could be part of the headset, but it's more likely to be part of iOS/macOS and a feature that aims to help them sell more of their existing hardware ranges.