I finally started playing WoW this spring... thinking I'd be able to progress through the game at my own speed since Azeroth's not going anywhere, right? Needless to say, I have mixed feelings about Cataclysm and wish I had started a few years ago.
After trying my hand at several race/class combinations, I settled finally on Tauren Druid. Her name is Muchao, and she lives on the US-Fenris server. She's been functionally abandoned since I moved to US-Sisters of Elune, and I'm probably going to pay for a server change to move her over to SoE soon. I miss her Moonkin form. Especially in battlegrounds.
When I started on SoE, I also decided to give a gnome a try. Fizzytwizzle is a gnome mage, and is nearly always in-character, though I am relaxed about it when people talk to me out of character. I love the RP, and will mostly respond in an in-character way, but I'm not going to get myself all hung up and demanding that other people do the same. I use the MyRolePlay add-on, and usually only approach other people who use it because I can look at them and be sure they're in-character. I have a certain degree of social anxiety that, after struggling with it all day in the real world, I can leave it behind by doing things in-character in the game.
I totally understand the "too busy with real life to play" thing. Muchao almost reached level 50, Fizzy is coming up on level 40. Other characters I fiddled with range from almost but not quite that point, down to a couple I still couldn't log in and get a mount for, even with mounts being at 20 now. I take the game at a slow, relaxing pace, and only for my "off time" at night and maybe a bit extra on weekends. Mostly, I'm too busy being artist/ wife/ errand-runner/ etc to be flying through levels and content.
On the subject of guild... I think it might be interesting to have more than one guild. I've never played on a PvP server, but I can see how the same guild would be quite different on Normal and RP servers. I can picture the guild being a big hit on SoE, but that could just be due to seeing the server through my gnome's eyes. She's part dwarf, was adopted by dwarves, and lives in Ironforge. Most of her friends are dwarves, except for a Night Elf who moved to Ironforge. I rarely see anybody who isn't on their way to or from a tavern, or who doesn't love to drink. I have to carry a stack of some booze with her at all times because of the drinking. And I incorporate her pets into the RP. I have a Pandaren Monk, so Fizzy will tell you he's name is Brewmaster Sweetbrew, and that he's visiting to work on inventing new brews to take back to Pandaria with him. Brewmaster Sweetbrew has been pretty popular among people who move in Fizzy's social circles.
I also agree with Faisca about some folks being unlikely to head to a new server. I'd hate to play anywhere other than SoE, after having tried quite a few Normal and RP servers before. But having different guilds for different types of servers might fix that?
I don't have Fizzy in a guild, but her dwarven brother is played by my husband, and I've told him about Fantasy Brewmasters. He thinks it's an awesome idea! Everything from the beer concept to the community-driven business model sounds to him like something that can attract passionate people and really boosts the "geeks are cooler than you think" image. Of course, he's a video game and fantasy geek who did his fair share of drinking in the Marine Corps, so what do you expect?
I also mentioned it to a friend who plays the dwarf hunter my gnome mage spends the most time with. I didn't really get an opinion from him on the overall business idea, though. He was kind of focused on the "I'm going to draw a dwarf for this and see how it goes..." part. He got gnome art from me once, so I can't blame him. Mostly, though, I don't get much chance to mention it to people because of the whole in-character thing.