i disagree that they are controlling the economy. i'd argue that the naysayers are the ones driving down the price and thus the eonomy. they've flooded this forum with FUD since the Spring.
If someone was dropping huge quantities of bitcoins to "control" the economy, they would be diluting their power pretty quickly. Basically it is better that someone dumps all of their coins now and causes the ripples in the economy when it doesn't really matter much.
It's not about the actual act of dumping coins, it's about the threat that they could do so at any time and cause economic turmoil, that makes a currency untrustable. I completely agree that it would be better if someone dumped all of their coins early on. It would spread the coins so that a single person doesn't have that kind of power anymore. But, with early adopters STILL holding on to Bitcoins, that threat is still there. And it will be there for a long time, even if those early adopters DO move their coins, simply because we wouldn't know whether they just moved them to a set of addresses they own elsewhere, or whether they actually sold them to a variety of people.
In summary: Dumping coins causes a currency to become unstable (with regards to its value), and the threat of dumping coins causing a currency to be untrustable.
its not worth worrying about large holders b/c they are just part of the market and will always be there. there's nothing you can do about them and you have no way of predicting what they'll do. and there will always be some of us who have more money than others. for all you know they all might all have agreed to not ever sell a coin until the price hits $10,000.