I disagree. Stick (and perfect) what you do best naturally. Yes, you don't need to have a CS degree to be good at programming, but you DO need to have a passion for it. Actually, having passion for what you do is what makes you an attractive partner to start a new business together. I personally could care less if it's a law or technology, as long as you're in love with what you're doing and it fits the objectives of the venture.

Don't force yourself to be someone you're not.