All the concerns about andromeda can be solved by Bioware simply nutting up and picking an ending to the trilogy.
Plenty of IP's have done it before and were better for it. Biowares only hurting itself by avoiding a hard world state.
they pick one, they can then easily do a curtain raiser explaining in the aftermath of the reaper war the galaxy rebuilt its self adapting reaper teach and expanding throughout the milky way. but as they did so, a new threat emerged which threated to destroy the milky way its self, not a race not something that ccan be fought with bombs and guns. i don't know something like dark energy starting to destroy entire clusters. the race was on to find a way to save the galaxy, but in the mean time millions of people became refugees.
then in 2...... a colony ship reached a previously uncharted region of the galaxy where they found an anomaly. study of this anomaly took decades before they scratched the surface of what they were dealing with a massive worm, 1000's of ships belonging to refugees, explorers and cults fled through it before any one race could secure the area, none were ever heard from again.
Then in 2...... a break through allowed the wormhole to be mapped and for the first time we learned where it lead. a new galaxy, a new hope, a new home and a why to survive................................... the ARK PROJECT.
see that's some semblance of a plot which took me 3 minutes to come up with, it makes sense, there's backstory, there's an explanation of why were meeting korgan in another galaxy. we understand why were going. etc ,etc. so why do we need a hard world state? because synthesis does not lead itself to storytelling that whole merge rubbish destroys the uniqueness of all the races and boringly gives everyone green eyes.
if this ark business pre end of the war. it just feels not only contrived, But it doesn't answer the question everyone wants answered in the aftermath of the trilogy................. what happened Next.