Could Sonos Fabric finally solve the Era 300 problem?

The ungoing rear speakers dilemma 

My Era 300s are fantastic as rear surrounds with my Arc and Sub. They’re also fantastic as a stereo pair for music. But moving between those two setups means removing them as surrounds, creating a stereo pair, running Trueplay again, and then reversing the whole process when I want my home theater back.

I’ve just read about Sonos Fabric and its Positioning Technology, and my first thought was: could this finally be the answer?

Sonos says compatible speakers will be able to recognize where they’ve been placed and change roles automatically. A Move 2 or Sonos Play can become a rear surround when it’s moved into position, without the owner having to rebuild the system manually.

I know this hasn’t been announced for the Era 300, and I understand the technical details may be different. But if Sonos is now building speakers that can change roles depending on how they’re being used, this feels like the perfect opportunity to revisit the Era 300.

What I’d love is very simple:

A Home Theater Mode that keeps the Arc, Sub, and Era 300s exactly as they are now.

A Music Mode that lets the Era 300s use all their drivers as a stereo pair, keeps the Sub available, and remembers a separate Trueplay tune.

Then one tap to switch back.

I dare to say this feature request is really high on Sonos owners' wish list.
Not only in the Sonos community, but also on Reddit and various forums, people wonder why this is not possible.

Consumers expect something like this from Sonos as well. Especially because it isn't a traditional company.  I find it such a shame that the Era 300 can still be utilized to its full potential right now when using them as a surround setup. 

It feels like I bought a Ferrari where you aren't allowed to press the accelerator.