I'm certain places like that exist, but I'm guessing it's far less than most would imagine.
My bet is a non-insignificant amount of sirus's money today comes from their model of making subscriptions really annoying to cancel. And, of course, preying on old people that may have forgot about their subscription or don't get streaming.
I wonder if it's worth waiting for T-Mobile's satellite features, or if I should move to Verizon?
Driving up from the SF Bay to Tahoe, you'll lose cell service as you pass through the mountains - especially if you take the Highway 50 route. Drive up to Oregon, and you'll lose cell service for a long stretch roughly near Klamath Falls. (As an aside, that part of the country doesn't even have NEXRAD weather radar.)
And this is all while on the freeway or major highways. There's plenty of places out west without a reliable cell signal, or sometimes a signal that's so weak that it's not usable for data.
For me it mostly replaces my CD changer, which doesn't exist in newer cars. When I can't decide what to listen to, have poor signal, or don't want to fiddle with the controls, it gives me a nice selection on fallbacks.