As a guild leader and someone who has made multiple guilds over the years in multiple expansions I can see a steady decline in people wanting to join guilds. I noticed this about a year ago but mainly in Legion. So many people have become comfortable with playing solo and preferring to not commit to a guild or a team. Over the years Blizzard have removed the need for guilds by making perks less interesting and now With the WoW communities there is even less reason to want to be in a guild. You can now be part of multiple communities and teams without the commitment and you get your own chat system too. So basically all you would miss is the bank system and to be honest that's not a big deal since a lot of people bring raid mats themselves these days.

I feel like Blizzard need to really revitalise the need to be in a guild. 10% increased running and mount speed, 15% additional gold looted from monsters, 10% extra rep gained from factions, free repairs when in a guild dungeon or raid. Maybe even a guild ranking or prestige type aspect where you can rank up in your own guild and gain bonuses as you rank up by doing events with guildies. It would make recruiting a whole lot easier and encourage guildies to play together and give you other stuff to work towards. Instead Blizzard are choosing to take a route to make the game EVEN MORE casual. That's just my opinion on something that could potentially improve or ruin quality of life coming in BFA.