The L1 device key they posted was already revoked earlier today. The tools themselves might continue to work for a while longer with an appropriate non-revoked key depending on how much services want to change up their APIs.
Main game should be rotating the L1 keys. I don't know about L2 keys, but rotating L3 keys seems like a lost cause to me, some dude made a Chrome extension that can extract them.
Some theorise that Microsoft's Pluton/TPM antics with Windows 11 are a ploy to bring L1-style keys to the desktop.
https://www.extremetech.com/computing/317512-microsoft-pluto...
https://www.anandtech.com/show/16269/microsoft-pluton-hardwa...
As for L1 on desktop, Google did announce exactly that [1], but TPM would be likely too weak for that, so maybe something like Intel ME would be used. But so far there's no evidence of them actually rolling anything like that out. So for now if you want hardware DRM on desktop you have to use Edge or native Windows 10 apps with PlayReady DRM.
And about the APIs, streaming services do sometimes change up APIs, make old app versions stop working, etc., but often things work with no or minimal changes even years later. They do have to be careful not to break compatibility with all of their own apps across multiple platforms as well.
[1] https://web.archive.org/web/20210819093936/https://widevine....
(I don't know the details of how to dump the keys, I just know it's possible by definition given the security loss on that platform, and I'm sure some people have tooling for this somewhere)
However, most people nowadays are simply exploiting phones and tablets with old vulnerable MSM chips, there are a lot more of those to choose from. Usually what Google does now is when someone publicly leaks a compromised device key, they revoke the unique key of that specific device but not the whole model. However, sometimes streaming services (especially Amazon, Netflix and Disney+) may still choose to blacklist an entire vulnerable model and limit it to SD playback.