You have a very good argument here. Yes there are already alts out there that are better than BTc when it comes to the purpose and the whole decentralization thing.But bitcoin was the first and as you said  people wanna make quick money after seing how much it grown this past months. So one of the main attraction about bitcoin right now is not his purpose but his price . Besides how do you expect to control those big holders ? they are investor also and opportunists ,That way you are suggesting that the network should make a limit on how much bitcoin you can hold ? Where's the freedom in that? isn't BTC all about having your freedom over your assets.