I think these are the #3 main defining and important features of an MMO. As we have gone further into expansions, we have lost more and more of these things.
My most fond memories are all related to the people I was with when I was playing. From vanilla, to TBC, to wotlk, to CAT, etc. It was always the people I was with, and never the actual content. I'm sure many others feel this way too.
My friends have always what have given me a reason to keep playing, or coming back. Their company is what I enjoy the most, and makes even the most boring mundane tasks fun. Just messing around talking to friends while doing stuff is great.
Why don't we do something to fix this In Legion?
My proposal:
Doing instanced content with a group/raid with x number of people on your server(say 80-90%?) gives you double drops from everything.
Ok, let's say that screws over the randoms in the group. Then make it 100% of the group/raid from same server gives double loot.
This GREATLY encourages you and gives you a HUGE incentive to group up with your server and try to make friends on YOUR server only. In return, this will help make the community a better place because you don't want to be that ninja or rude person - you're literally screwing yourself out of double the amount of loot if you're blacklisted from groups.
A smaller player pool makes for a better player base because you see the same people many many times with a small player pool, compared to one of millions where everyone might as well be an NPC to you because you don't know anyone and rarely encounter them multiple times.
Why do so many people make their best friends in school? Because they're forced to see these same people over, and over, and over and eventually learn things about each other. Someone familiar to you causes you to be more social and lets the shy/social barriers go down more easily if you're used to seeing them around.
Yeah, this will suck for dying servers, but it's in Blizzards best interest to also group small servers together into 1 big normal sized server so they have a community too.
This will really allow players with limited time to get loot, wihle allowing those who want to get more loot and have friendships and community again the option to do so. This change promotes and encourages both play styles while not taking anything away from either of them. It's a win/win situation.
TLDR: Group small servers together so that their player base is the size of a normal larger server, give double the drops per boss to groups that do content with 90-100% of the group from the same server.