By the time Yggdrash main net is released, ICON would probably have over 10 dApps/ICOs running on the platform and its main net would be running for over a year already. Network effect is crucial for blockchain, so i believe it would be very difficult for Yggdrash to compete against ICON.
And their competitor Hycon have maiinet already and listed to Okex and althrought Hycon trading in just 0.28x from ICO price in usd only