Would it have been possible for someone to have bought/acquire like 333,333 bitcoins in march of 2010?
Don't think out of the line mate, there is as many as available bitcoin for anyone to buy now and even when bitcoin gets to $1,000,000 anyone financially buoyant enough to buy above the 333,333. It all just depends on how much you can afford. So it is literally not the available bitcoin to buy that matters but your budgets for the purchase either in one time entry or the Dca approach is all good to buy as much as you can afford.