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Lets see...you can use PWM on brushed motors too, if you're looking to save a bit of power.
And there's no real need to use rare-earth magnets in small-output motors such as these. Your more common/cheaper magnets, like ceramics, will work fine.
I'm not sure how much longer a brushless would last than a brushed motor as a fuel pump. They last one heck of a long time as it is. Without taking a dead one apart, for all we know it could be the bearings that wear out first. You'd probably also want the control circuitry to be separate and easily replaceable, in case it goes before the actual motor does. There is no control circuitry to be concerned about on a brushed motor.
I like the idea. I just don't know if they will last considerably longer or not.
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