I agree with you, the way bitcoin is going, it will be only a store of value. The problem is, the real value will come if people can use the token for everyday use, that will be the intrinsic value. If bitcoin is just a store of value, its very likely it will fail.
About Ethereum, fees will change slowly with Proof of Stake, but for fees to go down, Ethereum needs to be mass adopted. Let's say transaction validators need a certain amount of funds every day to keep the system going, cover their costs and get a profit. The more transactions there are, they cheaper they can approve a transaction and still be profitable.