From where I'm sitting, I feel getting both Matt Ryan and Dez Bryant for DeAndre Hopkins alone is a bit of a steal.
My argument: Flynn is the top scorer by far in our league. Of course, he will regress back for sure, as I doubt his current production is sustainable. However, I would argue he is currently a high value commodity.
Dez Bryant is injured, of course, but is likely to return in the next few weeks (should we believe the most recent news). While it is hard to determine what his chemistry with Dak will be, he still has some inherent value (although admittedly in my opinion is less than the value of Hopkins, of course).
I have had DeAndre on my team two of the past three years and love the guy as a fantasy wideout, but so far with Osweiller, he's production has dipped a bit. I'm sure he'll be productive in the long run, but getting both players in return for Hopkins alone still seems unbalanced to me.
However, a previous poster provided an argument of it being mutually beneficial to both teams. That's an argument I can buy into (and be convinced of).