I’m pretty sure Valve Software surveys say that only a very small minority "easily spend over $2k on hardware". Especially considering that VR would be in addition to whatever they spent on hardware already, and that these $2k would be on a single device instead of slowly upgrading hardware over time.
In any case, I see two possibilities:
VR gets so good it replaces traditional PCs, freeing up the funds used for that. (Apple might be going in that direction?)
VR gets so cheap (while still good enough) that everyone wants one in addition to whatever they have. (Facebook tried that. Partial success, since the experience was very limited.)
Personally, I’m hoping for the first, and I’m expecting it to come by 2025.