Bluetooth is certainly an evolution of the existing communication protocol, but until the limitations are resolved, I am happy with TMCC/DCS.
It would be interesting to see of Bluetooth 5.0 is on the radar of the manufactures. Most important for me is the greater range 5.0 offers. Having two devices connected are also a huge step in the right directions.
Unfortunately, for our modular group events, Bluetooth is really not an option for us, but works fine at home on the smaller layouts.
Charlie