I'm still stuck on 60's/70's stuff!

There are very nice kits from the sixtys available but the prices are climbing more every day soon they will not be affordable to the average joe .

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Future collectible drums would probably be the type that are used on important recordings. I highly doubt that ANY boutique builders drums will be worth more in the future than they are worth right now. Most of those Keller-shell-built drums will become the future stencil kits, in my opinion. All the stave shells will be coming apart in the future, so they won't be worth anything! ;) Maybe Yamaha Recording Customs will probably be on the list in the future, because of Steve Gadd, mainly.

Lang/Gladstones will be valuable in the future (as they are now)

"Weirdo" drums like Peavey Radial Pros and Arbiter AT drums might be of future interest to the design-collectors -in much the same way that Trixon Telstar and Speedfire kits get our interest, today.

Mass-manufactured drums made today are constructed by something like a HAL 9000 computer -not Jim or Ruth from the neighborhood. Can anyone even name the CEOs of Yamaha, Pearl, Tama (without Googling them!)? I can't. But I know the names of Bud Slingerland, Bill Ludwig, Joe Rogers and Fred Gretsch!

What about Johnny Craviotto. You don't think his drums 25-50 years in the future might be collectible? Especially the ones he personally signed which I believe is a number of them, including one I own which he made when he was still making shells for DW. And I know he signed it himself because he did it right in front of me at a DW presentation at Jersey Drums and Percussion in Edison, New Jersey.

and how do explain that not even the cymbals, no one can produce something as decent as the old Old K?

only Spizzichino had succeeded to get closer and worked raw bases imported from Turkey,

those who succeed would have a slice "of niche" market but still quite large ! all continue only on the road marked by Agop and Mehmet, but evidently it is not the right one !

Keep in mind that not every Old K was a winner. I have a nominally 20" Old K new stamp that looks incredible but sounds like crap, overly bright, metallic, and clangy. And, there are also some new cymbals that come close to capturing a vintage sound. I have a brand new 22" Avedis ride at 2422 grams which is one of the best sounding Jazz rides I own, and I own a number of medium and medium thin vintage A and K rides. I know the patina Zildjian put on the Avedis ride is marketing hype to give the impression of a '50s cymbal, but the overall sound is incredible and similar to some of my 55 to 70 year old vintage A's, and better than most of them.

let's say things like they are! that in the 80s the kits, between drums and cymbals, and partly also the heads (I say it even if i are vegan but so far it is so!), he ended up being a musical instrument becoming exclusively a set of objects to be taken with strokes with rhythm, discouraging many begginners for the total inexistence of musical properties

New stamps are still desirable and use the same bronze alloy as the older models as far as I know. I personally have read nothing to the contrary. The new stamps and the new new stamps were the last of the Old K's made in Istanbul. I have another 20 inch old K new stamp which is one of the most musical cymbals I own. On the A side I have a trans stamp from around 1950 that is to die for, and looks as good as it sounds. But, we digress from the topic at hand.

Who knows what pies will be like in 30 years when the molecules relax