Do not worry too much, adoption is on its way that makes holders of Bitcoin forced to spend them or sell them.  Even if only 1 Bitcoin is for sale,  there will be 100,000,000 units of satoshi available to market.   The increase in value will be tempting so that those who holds them will eventually sell their BTC.   Besides there is other factor that influence the adoption of Bitcoin not just Bitcoin itself being available in the market.  That factor includes, advertisement, regulations and government acceptance.  Advertisement and government acceptance brings more impact than Bitcoin being available in the market IMHO.  See crowdfunding system, people buy and support the project even the project itself is non-existent.