It seems wise to have at least one alternative mobile phone app store. Even if it isn't very good. If the government can tell Google to do trivial things like, for example, change the name of bodies (plural now) of water, it can turn off your app updates, trapping you on insecure versions indefinitely. This probably matters more if you live outside of the US, but if I had a plan B for an app store on my phone, I would certainly at least evaluate it.