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One of the great things about the volume/volume on a J bass is the ability to roll the neck pickup volume back just a slight touch (e.g., 10% or less) This still keeps the 'humbucking' thing in place enough to mostly eliminate hum with single coil pickups, but results in a nice bump in the mid range for a more articulate burp. Same thing with rolling the bridge pickup back a touch if you want the big boom.
A volume/blend configuration would allow you to keep the ability to vary the pickup blend and also have a single 'master volume' knob.
A switch would be a disaster on an instrument with single coil pickups, since the 'all or nothing' thing with only one pickup one would cause lots' of hum.
Finally, if you really like the sound of extreme 'blend' settings (i.e., all neck or all bridge pickup), you can swap your pickups out for split coils, which will totally eliminate hum and still get you close to a true J tone.