You're a braver man than I am. I wouldn't do wedding photography if you paid me all the money in the world, so giving that up will be good for your soul. Too many personalities to satisfy, and in the end, none of them are ever really happy. Let's not even talk about who's gonna be happy 2 years down the road! Portraits, that's where it's at in my place. You get to do it your way, and if you know what you're doing they'll be as happy as a pig in poop. Or you will be anyway. At least SOMEONE will be happy. With portraits, every single shot can have a totally different feel to it. If you did 100 portraits of the same person in one session, they would all look very different.
Since tomorrow may not get here for some of us, it's surely best do what you want today, so I would make the changes ASAP. If it doesn't work out, you can always buy the wedding gear stuff again. I find it's a wonderful thing to try new ideas and fall flat on my face at first. Or, as the fortune cookie says here in front of me "Failure is the mother of all success". How true. I got another quote on this subject from Nanci Griffith. "There's no need for any human being to ever be complacent". That's one I think about every single day. When we're complacent, it may feel comfortable and pleasant, but it's not a place to stay, it's a place to visit and go back to now and then. So get out there and really screw things up doing things you have no business doing. I remember reading about Edward Manet and his difficulties w/ a portrait he was trying to do for a lady. He failed over 60 times over the course of a couple of years before he finally gave it up as a bad bargain. Maybe he should have tried it 61 times, maybe he realized that he had tried his best and it just wasn't in the cards, but at least he stuck to it.