As an experienced web person-meeter, I'd say it depends on the nature of the relationship. Unfortunately, the chance of a relationship improving is very slim, even for a very casual type relationships. The problem goes something like this:
1. When we're typing, we can think about what we say. Conversations in real life are SOOO different.
2. People have all these little annoying quirks, that just bug the hell out of other people. The worst in my opinion is the 'Small Space Bubble' phenomenon. When people talk to me they need to be at least a few inches away from my face. You know who you are.
3. Antipication of physical appearance. I cannot quite put my finger on it, but people get REALLY weird about anticipating other people's physical appearances. Then when you meet the person, they never look anything like you imagine, or not quite like the picture, and it does something to you mentally. Like I said, I cannot put my finger on it.
So, though I doubt I'll be able to make it... you can improve your chances by:
1. Use good judgement, and don't open your mouth too quickly.
2. Use good manners. Don't spit in people's faces. Don't chew like a cow. Don't talk or laugh obscenely loud (don't worry, this all comes later, after you get used to each other).
3. This is the tough one. Absolutely do not anticipate physical appearance. You are who you are. Who cares?
Ok, that looks like it went way too long and off the subject so you're all probably bored by now. But if it makes you feel any better I've IRL made friends of folks who have ALL the annoying traits AND open their mouth before their brain gets cranking. I'm sure I do it myself often enough.