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Scientists find a simple way to destroy 'forever chemicals' — by beheading them
(www.livescience.com)
This is a most excellent place for technology news and articles.
Well, since working in the industry, i can say with a very high confidence: There will be substitutes, but not for everything - at least at this point in time. There may soon very well be a breakthrough in material science, but at this point there is no alternative in some use cases (like gaskets, that have to sustain extreme temperatures and pressures...).
But i absolutely do agree with you.
Good old copper is pretty hard to beat for a high temp/pressure (or vacuum). Chemical compatibility can be an issue though.
Viton gets used a lot & I'm struggling to think of alternatives to it.