If a show really needs a cliffhanger the show should budget for an extra episode to air if the next season is cancelled. If they don't want to do that, just end the season finale without a cliffhanger.
If Netflix had this guarantee, I would watch a lot more series. (I'm still a bit upset that HBO cancelled "Beforeigners" that had a major cliffhanger)
Per Josh Whedon commentary [1]:
"This was one of the years where I was pretty convinced we would actually be picked up for another year, so we left a lot of things hanging. But at the same time I always felt if this was the last episode we ever filmed, it would be a good last one because it really did just get us into the minds of our characters, whom I love very much, and let them just sort of exist."
Providing such a guarantee would be akin to guaranteeing that a multitude of small businesses will not fail... which just isn't really possible.