tutv is not invincible. They use version7.6 cards which are not unglitchable, and encryption owners are fading out these version cards because they know they are hackable.
However, it will take a glitch/unlooper expert a long time and much effort to get a full rom and eeprom dump. Then you still need to disassemble the code, then theres the recently discovered asic part of the card that needs to be bruteforced once all other key index's have been discovered, and all this will be after a lot of logging over a long time.
So, no its not impossible, but a hell of a lot of effort, so may be a while yet before a true hack is available. I think top-up's initial predictions were estimated at 2 years..... how long have they been broadcasting now? Was it April last year, i cant remember?