as far as I've gathered, CGL is considering switching to PoD completely and is using House Arano as a test balloon.
Gathered...from where? Genuinely asking, in case there's another source of rumors I need to hunt down.
To be clear: I have heard absolutely no plans to cease the distribution of print sourcebooks through traditional channels. AS:CE will be on shelves, for instance.
The lack of print books on shelves would not be a growth indicator for the line. POD is another tool in the toolbox, which (in my view only) is probably best used to get OOP books back in circulation, and to enable the print availability of books which otherwise would never get a run.
That's what House Arano is a test balloon for - not a total switch-over to POD for everything, but whether a product which otherwise never would have been available in print could sustain its own existence via POD. I'll leave it to others to drop the "Mission Accomplished" banner, but its days-long run near the top of the DTRPG best sellers list should give you some sense of its success.