Treble is still a huge question mark and I wonder how successful it will be.
The idea of Treble sounds good allowing faster updates of the main operating system code by Google without having to wait and update the lower level stuff like processor, modem or camera.
But then if there is an update to processor, modem or camera drivers or features then those updates still need to come from manufacturer and that will depend on whether companies like Samsung may or may not opt to devote many of its resources to post-sales software support and to do so in a timely manner. All they care about is selling phones in volume and only care about the next phone coming out.
Fragmenting updates between Google and manufacturers could create more issues really... Google pushes updates to the OS whenever it wants, but because manufacturers add their own apps for phone, email, messaging, camera and they have to support hardware parts that differ between each model they sell AND on top of all that you have stuff like Touchwiz/Experience, a Google update can break any of the Samsung stuff and then you're hoping Samsung will be able to catch it and push out a fix in it's next Security update in a timely manner every time a Google update breaks something?? Ugh.