How many millions of metal frames have been produced and are still in existence in garages and sheds and basements? More than enough for every rider who is interested to find a metal frame and refurbish it.

Going forward, for the future of the planet, new bikes should be sustainable. Either Ca fiber or preferably bamboo.
There is no reason that anyone needs to buy a new steel or aluminum frame. No reason to degrade the atmosphere further and pollute its waters. No reason at all.