This is an interesting piece of what Google is planning with the Ara project and some elements of it are really quite radical, or at least I think so.
When I first posted about this, when it was just Phonebloks (I think that was the name anyway) I didn’t get a terribly good response. However, I think that a modular device could work really well for mobile music. The only proviso (and it’s a big one) is that there are the right kind of modules available to put in the device, and/or third parties have the ability to produce modules for the Ara project.
So I’ll be keeping an eye on this and letting you know about it from time to time.