I don't know when this will happen, but I think at some point in the future that proprietary class D will be ubiquitous. And different manufacturers (perhaps Bryston included) will design and develop their very own class D technology to have a sonic signature per the designer's or brand's sonic values. I know it may be hard to envision this, but I think it'll happen much like how transistors "replaced" tubes. That's not to say class A and A/B tube and solid state amps will vanish. I don't see that happening. I simply see class D proliferating. It has come a very long way over the last 15 years and it continues to get better. That's just my crystal ball talking to me. Only time will tell.