We also have no idea what the toll of dying/resurrecting is yet. They made it a big point in Season 3 to note that when you die and come back, you don't come back all the way. You lose things.

There are also very very very few people who can do this-- the Red Woman could birth shadow-monsters, and even she thought she couldn't do it (and maybe she didn't, we don't really know yet). So it's not like they're just gonna resurrect a billion people casually. Dead is still dead for 99.99% of the characters on this show.

I'm pretty astonished by all of the thinkpieces talking about how Game of Thrones pulled a "Walking Dead" here too, like this was a cheap ratings-grab fake-out and nothing more. As if shit is going to just be hunky dory and there will be zero ramifications to the death/resurrection. As if the storyline wasn't clearly building up to a death and subsequent resurrection. Like, if people are pissed because they were fooled by the actors/creators saying to the media, "Jon is dead!!", then that's one thing.