Rda is 70 now! Unless ur needed or a 4 star general, 55 is the cut off for service.
They would need a reason to shut the gate down and mothball the most powerful fleet in the tri galaxy area.. Military of the world wouldn't stop till they had 50 ships or more, space stations etc.
Not only that but I saw him do a interview and he looks like he is in really bad shape so I don't think he could pull off action scenes. But you could still have him involved as a civilian instructor or something. Personally I like the idea that Jack O'Neil is now President of the United States. Maybe he shows up once in awhile but of course with that job you got plenty of reasons for him not to. I do think they should have at least one regular from the old shows. To me it really comes down to Carter or Rodney and maybe Dr Beckett and Keller. Plus we need at least a line tossed in to give up some closure on Universe but I would kind of prefer we saw Eli because it would at least let us know he found away to survive at the end. I was thinking of characters I would go with.
I would expand the team to a 5 team group. Also we would see more missions were like in the movie you send many people on a mission. The stargate is public knowledge now and even though you have a earth gate Stargate Command is forced to operate off planet due to fears that something can come through and kill everyone like seemed to almost happen a lot on the old show. Plus it's a neutral place and not in America were naturally other countries would flip out over America having something like that over them. The planet would even have it's own little earth town with things like a movie theater, grocery store and things like that so people could have a taste of home so far away. It would be like a Atlantis and a joint Operation. the characters would be.
1 You would have a older Japanese man who is very rich corporate type and basically used his wealth to get the position but the twist is he is actually a good leader. He grew up wanting to go to space and is someone who is very stoic and serious on the outside most of the time but is underneath like a happy teenage boy at being able to have this job.
1 The leader of missions is a robot created specifically for this mission. He is very human like though with a friendly personality and sense of humor. Think of a male Janet from the Good Place. He is trained in military tactics but also science and he was also designed to not be loyal to any one country. He was built basically to serve Earth all of Earth.
2 McKay=He is divorced from Keller and has fallen on hard times. He has basically been working at a Game Stop for the last 5 years. He is given a chance to once again be part of something special and sort of make up for lots of mistakes he has made the last 10 years.
3 A female British Soldier who is B-sexual who has a thing for McKay. McKay and her would have a kind of romantic thing for each other and she is kind of shy and unsure of her because she was recently divorced and she had been with her wife since high school so she has never really been good at dating.
4 A American female archeologist who studied under Daniel Jackson and this is basically her first job after graduating but she is a genius which is how she got this position so young.
5 A female shapeshifter alien who doesn't know how to fight but she is 100 years old and is a kind of guild to the universe and knows a lot more than the humans do about what's really out their than the humans do.
Jason
