It will not just be the early adoptors that would appose this, every person who own bitcoins would be against such a flexible cap because it devalue their current coins as the cap is lifted and more coins enters the network. You are free to create your own Alt coin and then see how this will fail. The miners also benefit from the current cap, because the reward is more valueble than what it would have been if there were a flexible cap. What would you chose? 100 bitcoins @ $10/BTC   OR say 12 bitcoins at $800/BTC  < Just a simple example >

Bitcoin was based on Gold, and there are only limited amounts of gold deposits, which makes it more valueble as a precious metal. ^smile^