Amazon cancelled the new Stargate because....
From Giant Freakin Robot:
Amazon has canceled its upcoming new Stargate series because... and this is not a joke...
...they thought fans of Stargate would like it, and they want a different audience.
Under no circumstances allow Amazon to produce a new Stargate series.
https://www.reddit.com/r/Stargate/comments/1txc6x0/probably_dodged_a_bullet_there/
Amazon kills “Stargate” show made by original producers, may hand it to someone who would “give it a fresh new perspective”
https://www.reddit.com/r/Stargate/comments/1twmjov/not_the_fresh_perspective_we_asked_for/
Amazon cancelled Stargate because Jeff Bezos is a Goa’uld.