Maker works because there is multi collateral which is set to back it so it's not like Maker Dai is going to be backed exclusively by Maker tokens.

DAI is not backed by multiple assets...yet. The upgrade that will allow this is scheduled to go live on November 18th so that is not the reason it has held the peg. In addition to being over-collateralized the stability fee and the DAI savings rate play a role in maintaining the peg.

In the end these financial instruments can only hold the peg if the underlying asset(s) have enough stability and value to back them up. As I mentioned before I am still not convinced that multicollateral backing is enough to achive this. In my opinion you need a basket of assets that are not positively correlated in addition to an adjustable interest rate that can influence the supply and demand for the stable coin.