Whoa fellas! All is not lost and the future is far from bleak!
Having owned, been issued, purchased and examined many hundreds of well used 3rd gen guns, and shot the snot out of a whole bunch of them - far more rounds through individual examples than most average shooters will ever run through one example - I've only broken a MIM mag catch on a 4516-3 and chewed up a guide rod on a PC 4566.
Not bad I'd say. And I have never been considered "lucky".
As was pointed out above, where a market exists, somebody will fill the void and make a profit.
Buy them, shoot them, love them! Besides, lifes too short to buy ugly plastic guns with lousy triggers. If not a 3rd gen gun, then what?
Well........yea, there is always HK......
Regards 18DAI