Who needs the mirror?

[Daniel Browning]

Thanks for the response.

shutters give out after tens, or hundreds of thousands of exposures

Some photographers, like me, take 10,000 photos in a month. I'll do 5,000 in one weekend if I'm shooting timelapse. But I think we're a small minority.

- With a shutter covering the sensor most of the time, wouldn't a DSLR have less dust? With the sensor constantly exposed, I wouldn't expect less dust on the sensor.

I'm not sure. I've read that the air turbulence caused by a swinging mirror is what causes most of the dust. I don't think the sensor is "exposed" with liveview any more than with a mirror. The shutter can cover the sensor for lens changes just as well in both cases IMHO.