I think the important thing for "normies" is refresh rate, resolution, degrees of freedom, and viewing angles. The Oculus Quest matches or exceeds all current desktop VR systems on almost all of these (75 Hz, 3200 x 1440, 6DoF, and 110 degrees, respectively.) I think you can easily demonstrate experiences like Beat Saber and last-gen console games, and that's still very compelling for a mainstream audience.
Battery life is probably even less important than raw power, at least for the first few gens. These things are going to be played in homes at first, and likely not for very long. With that said, the Lenovo Mirage Solo (a comparable headset in power) lasts around 3.5 hours, and I'd expect the Quest to be similar. Plus, as long as these standalone headsets are based on smartphone tech, they'll pick up the various power-saving upgrades Qualcomm makes in the coming years.
I'm betting we're 1-2 years away from a $200 standalone headset with better specs than the Quest. And that's when I think this will go mainstream.