ETH is supposed to be an electronic contracts market.. Is everyone who writes a contract from now on going to include code to block using these coins as collate

ETH is supposed to be an electronic contracts market.. Is everyone who writes a contract from now on going to include code to block using these coins as collateral? If there's no consensus to interfere with the transaction, I assume people will watch the coins in motion and extend a larger map of tainted accounts and coins, yet be unable to interfere in many algorithm decided actions.