Heaven knows how many 3 gen pistols are out there. Many of them are still in service, even if they are no longer a common LE gun. People who have them will try to keep them running and will pretty quickly soak up replacement parts. Springs will probably be available from Wolff for some time, but I suspect the supply of other replacement parts is limited to what now exists. Parts that are common to several models will be the easiest to find. The stuff that's specific to one caliber or model will be the first to go. The first auto I truly lusted after was a 39-2 in 1964, when I was 15. I can probably keep what I have running for the period of time that I'm likely to interested, but their days are numbered.

I, and many others, have gone through this process with Colt DA revolvers. Smith and Wesson has at least not just walked away from their customers. They have a few LE users they will support as best they can, but in a few years, parts and service will be hard to come by.

I love them, but these guns are now part of the past, not the future.