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You do realize that a driveshaft or d.s. driven alternator only charges when the vehicle is moving, and at significant speed at that. In the hands of the general public this will result in dead batteries (too much idling).
You also realize that non-belt driven "alternators" are not new or unique; best examples being just about every motorcycle or small engine powered piece of equipment made in the last century. In that regard, I'm not sure why automotive doesn't do something similar. Perhaps it is harder to get the needed capacity, or more expensive. But it could be that the belt drive was there already and it's easy and cheap to glom an alternator on to it.
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