MadVR Envy and Lumagen external video processors have calibration tools in addition to DTM. Even leaving those aside, and forgetting about 4K for a moment, we must keep in mind that standard Blu-ray remains dominant as far as content. No one who has anything approaching a decent film collection will have more 4K programming than Blu for years to come. It is essential for many of us to have ever better processing for all of this content. I am absolutely certain that the best "mastered" Blu will continue to impress.
So, hopefully JVC will somewhat keep up with what the external processors can do.
HT: Panasonic DP-UB820 | JVC RS600 | 106" x 45" Stewart ST 100 | Cary Audio Cinema 12 | NAD M27 | Elac Uni-Fi UF5, UC5, Debut F5/B6; Focal CMS Sub
STEREO: [Shunyata Denali] Playback Designs MPS-5 (fully upgraded) | Cary Audio SLP-05 tube line level | Cary Audio SA-200.2 ES | Focal Diablo Utopia III DEN: 60" Panasonic VT60