Your question rests on the assumption that it's "my" router, since it's a piece of physical hardware that I bought, and that it will continue to function after they shut down the cloud-based features that they used to lure customers in and justify the price tag.

Past experience - most recently with Revolv - suggests that your assumption is wrong and Google has no problem bricking the device instead of letting it function without cloud support.

In other words: When Google shuts down a product, it's 100% shut down. Hence, I cannot understand why anyone would buy non-throwaway hardware from them.