“There need to be killer apps” you say, but have you looked at the VR titles on Steam etc?
There are already a lot of fantastic VR games. Touristy cities even have VR gaming arcades where you can pay high prices to play on their VR kits.
The main barrier to wider adoption is the high price for good VR equipment, and the runner up is probably the complexity of setting up and using the systems. So yes that’s similar to PCs in the early days, maybe like the 90s were with PCs and the Internet.