to be honest i dont think that ethereum will hold for too long due to its turing complete nature. indeed golem evolved into something that looks like specific cuts from zennet
Do you think the projects like Augur, First Blood and Golem can be easily moved to Tau-Chain if Ethereum is not working as expected in the future?
technically yes but they will have so much competition since tau will enable features that were not possible before (two examples: decidability and self-definition).