I love soup as well and notice that many low calorie varieties keep me full (almost stuffed) for awhile. Unfortunately it's one of those things where I "overdose" after several days and can't stand the sight of any soup for a couple of months! But if you're creative and have the time to lighten up some recipes I don't see any reason why you can't just live on soup and still lose weight.
When I buy canned/processed soup (which is more often than making my own) I always choose the lowest sodium options. One of my favorites right now is Trader Joes low sodium creamy tomato soup mixed with one half cup to a cup (depending on how hungry I am) of their rice medley which is brown and red rice and quinoa (I think.)
I think you can always supplement your soup meals with steamed veggies (if they are already in the soup even better) or salads and still consume very low calories while keeping satisfied.
I'm one of those people who doesn't believe you HAVE to consume dairy to maintain a healthy diet even though cheese is my kryptonite. Afterall many parts of the world do not consume dairy products at all and are far more healthy than North Americans. I do think it's important to make sure you are getting enough calcium - which can come from other sources, not just dairy. Sadly the Dairy Industry lobbyists have us believing otherwise.