Why should perfectly functional gear be binned because of lack of memory/processing power? An external device very like a raspberry pi with loads of memory can be integrated into the sonos system with a bit of ingenuity. The problem for any size of speaker system should cost 50 quid. Or put a sonos badge on it and charge 200.
This is planned obsolescence and there are enough items in landfill without needing a specific hole just for sonos' junk.
Fix this legacy problem with an external stand-alone memory/wifi/processing raspberry pi either as a day hack or put a sonos badge on it and vastly over charge for a simple solution.
The speakers are great, just a pity the imagination of the executive profitseekers at sonos.
Johnnydot