I can't tell with confidence that he will be stabler what earlier. I think doesn't matter how many projects were started on the Ethereum platform. It won't affect its stability in any way.
If all those projects contribute to enlarge the overall market capitalization for the Ethereum it could make the market more stable by making the market less vulnerable to manipulation as well as maturing the market through enlarging the market capitalization, it's a common sense but usually there's other factor aswell that could affect the market that's purely based on demand-supply heavily.