first of all my good friend it's 1 suggestion per thread and it should belong in the suggestion box cause this is a suggestion. Also, let me just answer couple of them for you cause i'm like the best.
1. There were complaints that imagine if some players take over a certain gym and decide they want to quit the game, bam nobody can get that gym anymore! get fucking rekt m8.
2. LOL
3. Cause that's important.
4, >Unova
5. I doubt it
6. They're working on it, those are just place holders.
7. I think the said it's going to be a thing in the future (2050) probably never.
You're welcome.