Technology

It depends on what you mean by special software, but current VR headsets already do that out of the box, it's just that their built-in multi monitor stuff is not amazing. Without any special software, you could have multiple apps open, and those apps could be any android app(including browsers or relatively bad desktop experiences like dex). The third party stuff you can download or buy is just way better. And it's also way better when the multiple monitors are your computer's monitors. Cuz then they have 50x the horsepower behind them. For current headsets, generally the best option is Virtual Desktop, if you don't need more screens than can be handled by high quality timewarp layers. You can get clear 4k or 5740x1080, or anything smaller. With other multi desktop options, you can get more total screens, but there is no point to picking anything above 1080p since even that is already not rendered clearly.

Solutions for current VR/MR/XR headsets will follow to VR/MR/XR glasses, since headsets and glasses are slowly meeting in the middle. Headsets will continue to shrink while packing in the same or more tech, and the glasses will slowly be able to handle more and more tech in their tiny frames.

There will always be full size headsets, but they will essentially be the PC equivalent to the glasses being the smart phone equivalent. We will also likely still have PCs, but it's concievable that a smartphone won't be necessary for most people anymore. And even for the people that would still want a smartphone, a "processing puck" for the glasses would be the more likely solution. Give them pocket computer level power instead of smart watch level. So you can play good games on them, like 10-15 years ago-then pc game graphics.