We don't need rare earths to make renewables, we choose them because they are cheaper; and calling renewables "so called" in this context is a bit weird even though yes the sun will eventually die.
Of course you don't need rare earths to build electrical wind turbines; the Europa paper I linked above explains that even today 25% of wind turbines are rare-earth-free, and people have been building large-scale electrical generators for 156 years even though rare earth magnets were only invented about 50 years ago.