Maybe vector-based CRTs like in oscilloscopes can be made small enough to use in headsets (if they haven't already). Either project floating text on transparent AR glasses or project a text layer on the lower resolution graphics display. I'd prefer the AR approach if it means I won't need a $500 GPU to generate floating text.
Sadly having an 8k screen on a smartphone seems mostly pointless, and achieving the necessary economies of scale is hard with VR headsets alone.
My biggest hope is a paradigm shift in UI design. Everything we have is designed to accommodate low resolution screens. With ubiquitous high resolution screens UI patterns from print like "lean in to read this detail" become viable, and if popular would justify much higher display resolutions, directly benefiting VR.