You'd hate to see the prices of old hweens then. Even to a time of say 2020 they'd be like 100-200 keys for a good one. Now? More like 1000+ keys. Most sit gathering dust in the inventory of a top tier trader who spends more of his time browsing backpack than playing the actual game. Go to like 2015-2016 or so and they'd go for like 50 keys. To think people say the real world suffers from inflation.
I don't see regular keys destabilising as a currency because they're the only real way of tracking cost (aside from ref, but at this point inflation is so high that a backpack full of ref wouldn't net you a high tier). It's the only currency around ever since buds died. For a market that isn't as big on real money trading like CS is (lots of underages and people paranoid about getting scammed of their bank account) it's the way to go.
Not to mention there's a lot of regular crates still out there, and it's actually still possible to drop regular crates, technically.
The market is definitely withering, unless some life gets pumped into the game or you see Saudis move from CS to TF2 (I've seen a couple instances of this so far), the trade scene will definitely eventually die, if only because there's much better markets both real and virtual.