If the revl arc really works well with linemount and strumount systems, then it is enough to bring some interest in it imho.
However I still don't understand why gopro and other action cams with tons of integrated sensors (accelerometers and gyroscopes...) don't use these data to allow perfect post-treatment stabilization.
The drawback of mechanic live stabilization is power consumption, which scarifies either the autonomy or the weight of the system (which is important for linemount and strutmount systems).
Whereas post-stabilization using recorded accelerometer/gyroscope data works very well, see these examples from the SteadXP
But SteadXP isn't perfect neither because it forces you to plug another device to your existing camera, bringing problems related to autonomy, weight, form factor etc.
Gopros and other action cams already have the hardware to allow this directly in the camera, they just need to provide the software to use the data in the same way SteadXP does...