Don't be ridiculous. Provide value to people. That's your job as an entrepreneur (hell, as a human being...it's what sets us apart from all other animals). If that value is better than existing businesses, great, you just made the world a richer place for everyone! However, I suspect you won't find that you can just walk into an existing market and eat the existing companies lunch.<p>You'll be shocked at how big some "small businesses" are, and how effectively they can compete with your new-fangled web-based concept (or whatever). Most won't even notice you exist while you bang your head into the market for three years or so--if you're still in business at that point and have actually acquired a large customer base before hitting the end of your runway, then they'll notice you exist. They'll have plenty of time to respond, either getting smart, or getting out.<p>Ideas are funny that way...you hit the market with a great, revolutionary idea, and one of the bigger established players spots it two years later and eats your lunch with it. (First isn't a guarantee of winning, or even a good indicator of it.)
Look at it from the customer's point of view instead. Is it bad for businesses not to offer competing products and services to you?<p>Remember you can't put another business out of action, only customers can do that. If you provide a better product or service customers will switch to you. It's democracy in the market place.
What if your idea will consolidate a fragmented industry and provide stiff competition to 'mom-n-pops'? Is it better if the small businesses tend to not serve the customer well?