Windmills and electric motors don't actually require strong permanent magnets - electromagnetism/induction is somewhat more complex to manage but potentially more powerful and efficient. This is not theory or speculation - Tesla car motors don't involve strong permanent magnets [1] Large wind turbines do not require large rare earth magnets [2]
(Im not saying powerful magnets are not very valuable, but requirements for them can be overrated)
(Im not saying powerful magnets are not very valuable, but requirements for them can be overrated)
[1] https://forums.tesla.com/de_AT/forum/forums/no-rare-earth-me...
[2] https://www.mathworks.com/help/physmod/sps/powersys/ug/wind-...