Yes, they should experiment with this class in Intercity trains (6 hrs journeys) to check for patronage. The GR Chair Car could accommodate 30 more passengers than your regular CC.
If the seats could be redone somewhat, it might just find a niche for itself between CC and 2S coaches.
Most...
more... Intercity trains have a high and consistent demand for air-conditioned Chair Car coaches (It's the Premium VBs which are hit or miss) compared to 2S coaches (which get filled with last minute bookings) given our weather conditions but the difficulty with directly replacing 2S coaches with CC would be the loss of capacity.
The GR Chair Car offers the best of both worlds, but is being deployed on the wrong train.