the dragons did not cause the doom. the doom as described in the show was most likely a massive volcanic eruption, ground ripping apart and fire from the sky and all that jazz
we still don't know exactly what the doom was and what caused it, you're also interpreting my comment a bit literally. Just like how Dragons seem to wax and wane with the presence of magic in the world, perhaps an over-concentration of magic caused the doom, i.e. too many dragons/magic in a small area = chain reaction, or maybe dragons were born of the volcanoes and the earth was just trying to reclaim them. In a world where there are magic seasonal periods, its probably a safe bet that the doom of Valyeria wasn't just a simple volcanic event. Basically, if the Others can cause crazy snow storms and winters that last for years, maybe dragons can cause crazy volcanoes/fire storms if there are enough of them.
the only dragons to survive were those the targeryans had, as stated in the show they got smaller and smaller each generation until they were gone
likely due to massively reduced numbers for breeding and the fact that they were not free to roam and kill as they pleased - which I believe was stated in season 1
or it has to do with the decline and reemergence of magic, also stated in the show
Or maybe all the unpredictable outcomes is only to set up the predictable one?
We could keep at this all day couldn't we?
If nothing is what it seems then I could be right? Maybe? But it is fun guessing
yeah, you could be right, but that doesn't make it likely. Song of ice and fire, not a song of ice vs. fire, maybe the others and the dragons are really duping the mortals the dragons and zombies are just going to team up on all the humans. Maybe they're actually champions against the true evil, the many faced god / aka the god of death and they're fighting to conquer death in the world but that they're sort of rivals going about doing it in different ways. Maybe they're all just servants of the same evil god taking on different aspects (ice, fire, old, new, many faces...) and that humans need to overcome them all. Right now all the options are morally grey at best.
Sure, flying fire-breathing dragons into battle to take on the evil ice zombies/wizzards is one of the sexiest possible face-value endings available, but then Robb riding into battle to deliver justice to Joffrey and living happily ever after while ruling the seven kingdoms and making lots of babies with Oona Chaplin was a very sexy face-value ending as well, instead Talisa gets shanked right in the baby bump before Robb is finished off with other pointy ends in front of his mother who gets her throat slit. Yay!
If we get fire dragons vs. ice zombies/wizards, its likely not going to produce what we expect, e.g. the dragons don't get there soon enough and the ensuing roflstomp is a hollow victory, or the epic battle claims the lives of the dragons and Danny saves the world but at the cost of giving up her own power and the throne is claimed by some asshat as bad as any of the bad kings we've seen.
The beauty of this show is that we really don't know what is going to happen. Maybe Danny and Tyrion get eaten by the dragons in Ep9.