Its been discussed ... no concrete plans yet ...
MadVR in its current official release form is still excelent for watching anything ... upscaling is still top notch with NGU.
HDR tone mapping is static but outperforms most consumer products ... I would say its still top notch for living rooms for years to come.
Dedicated theatre rooms is a bit different story as projectors dont have the brightness of TVs. For these application, most enthusiast use MadVR beta 113 that has dynamic tone mapping (which JRiver does not officially support). In this application, for the money you shell out for top notch GPU to run MadVR ... it might be worthwhile considerig Lumagen RadiancePRO (MadVR Envy imho is just way too expensive) as it will allow you to use Video Processor for other video sources (TV, games).
While madshi stand by HTPC madVR ... lack of official releases for so long ... is a bit unsettling.
PS. Also ... what exact features you think MadVR is currently lacking that will spell doom one day
PSS. Plex and Kodi been doing their own tone mapping for years now ... and its still so so