Once companies started using CCAs instead of old hard wiring this was due to appear at sometime. This isn't necessarily a super "game changer" but a very cool and useful tool for someone who has a wide variety of sounds they need to access during a gig. Much easier then fiddlin' with knobs and amp EQ.
As you know, if you have a POD, BOSS or some of the other pedal and rack mount pre-amps you can already do this, but having it right there in the bass is fantastic. I think if more instruments are going this way it makes the opportunity for a cost effective 1000W amp. Tech 21 already is nearly there with the Landmark amps that offer powered cabs to pair with your SANSAMP pre-amp, so now you can almost use just the bass and a powered cab.
Interesting. There is the Gene Simmons approach (volume knob on bass only) and now we are getting closer to the Gene Simmons approach on the amp (volume knob on amp only.)