I think it is realistic to expect virtual miniatures to be non-random. In fact, I think it's likely they will be sold individually.
I think it is likely they will be cloneable.
I think the prices people are expressing willingness to pay are super mega-unlikely. If Wizards will charge the exact same amount for virtual Magic: TG cards as they do for real ones, there is no way I see them giving you every monster in the Monster Manual for a few, or even ten, dollars.
Here is what I would guess:
$2-3 for normal-sized monsters, like orcs.
$5-8 for larger things like bullettes and giants
$10-15 for dragons, demon lords, etc
I just think this is realistically what they will do, not what I hope they will. I kinda assume they would be cloneable. It would be too hard to come up with a price point for non-cloneable minis. But they will still try to get more money out of you buy doing things like "orc with sword", "orc with axe", "orc archer", "orc wizard" and so forth. Many will succumb to the temptation of having that orc raiding party have a look of variety.
Thus ends my prediction!