That is never going to happen, when Treble came out we thought it would change, but since they don't force OEMs to actually deliver updates, everything stayed the same.
When questioned about this on the Android Platform 11 AMA last month, they stated that they think OEMs freedom is what makes Android a rich ecosystem.
So there you have it. Can check by yourself on Reddit.
The architecture is a cool design, where Linux gets encapsuble in a kind of micro-kernel where classical drivers are "legacy" drivers, and Treble drivers get their own process, can be implemented in C++ or java, talking with the kernel via Android IPC.
However not forcing OEMs to provide updates, even with Project Mainline and GSI now as Treble updates, doesn't change anything from consumer point of view.
When questioned about this on the Android Platform 11 AMA last month, they stated that they think OEMs freedom is what makes Android a rich ecosystem.
So there you have it. Can check by yourself on Reddit.