Imo three important points for an alt coin being successful are that the coin offers something unique, new and useful to the community.
Creating a stable coin fulfills these three point.

But unfortunately there are a lot more things you need to take care of to make a coin successful. At the moment I dont see that this is happening.
Rather reschedule the start and invest some more time in planning than launching an unfinished product and wasting the brilliant idea of creating a stable coin.

As a lot of people already mentioned. The "faith thing" is not going to work. No way you can trust in the faith of 1000s of users. Someone will start selling cheap and the rest will panic and follow. (See what happened to Panda coin today)
It sounds like a good idea to have exchanges regulating the price by keeping it stable to 1 €. But what would you do once 1 exchange platform decides not to play any longer according to your rules?
5400000000000 each being worth 1 euro and ppl mining 1000s and 10000s of it with low difficulty at day 1? Not going to work out I would say.

What about regulating the price by having a flexible reward system. The amount of coins per block increases or decreases with the value of the coin. As long as the coin is worth 1€ the reward per block is i.e. 100000 coins. Once the value of the coin goes up the reward increases and vice versa.

Good look with your coin. You might need it.