You apparently think the Pay TV providers can issue new smart cards on a semiregular basis. No, they can't. They operate under approximatelly the same constraint Microsoft does; updates to their core protection scheme are ludicrously expensive.

(Microsoft could use the exact same scheme by bricking their devices with fuses when they fail some routine checkup; they could also brick every device and then issue a recall/reissue. They have better options than that, though).