In my opinion, there is no need to strive to ensure that ethereum mainly acts as a store of value, as Bitcoin does now. The main purpose of a decentralized cryptocurrency is to be an alternative means of payment to the current payment system. However, any type of money includes all functions, including a store of value and value. But the function of the means of payment must be decisive.
I don't think there is a real threat for ethereum to become like Bitcoin. Thousands of tokens have been created on the ethereum platform, the movement of which requires payment with this coin. Therefore, there will always be an ethereum movement.