1) Fine, in your madmax future world, the level of tech might be lower... *shrugs*
2) I doubt they're going to hate a 14 year old girl with cancer. Some billionaire shithead who led a company that actively harmed the environment... Just imagine if the Koch brothers were frozen... We might want to wake those fuckers up just so we could use them as pinatas.
3) Do some research on the inviability of cryo.. At last check they're doing stuff like at the moment of death, pumping out all the blood and replacing it with antifreeze and using other techniques to prevent cell damage. Private labs have also been doing experiments on animals with limited success.
I also agree with your last point. However, I think we can do both. We can focus on cures now and work on the technology for later.
On a somewhat serious note, when it comes to deep space travel, cryo storing people might be the most sensible way to say colonize a distant planet where the ship is going to take 1,000 years to get there. Yes, yes, I know there's a WHOLE shitload of technical hurdles, but if we got the cryo stuff right it would give us that option.