It isn't so much the price, it is what has been received for the premium pricing.
Playing ESO, it is such a much better game. Destiny has a handful of things better, such as graphics, the very basics of how the game feels, and it has guns though those seem to be going away for bows and hammers :P
And then pretty much everything else, ESO is better in. Anything it has shortcomings for, it doesn't do so badly with either. Their world is nice enough looking and has the benefit of, you know, being actually interesting.
Destiny: check the board to see what four activities you can do this week.
ESO: Go anywhere at all and land quests, find dungeons full of items and weapons. Oh and while you're busy, you hear war horns and chains and see a mob spawn nearby which everyone rushes to and stomps the enemies. I love it.
The only way to make ourselves heard by Bungie and activision is to not buy TTK. Making us rebuy content to get parts of the dlc is low and underhanded. Without our money, they don't get paid. Do not preorder TTK and make them know that the community needs to be heard. Copy and paste this to spread the word!