Should I patent a cow-catcher McLaren accessory?

I think you're only looking at half the story here - yes, pushy yuppie parents with strollers do need to clear the sidewalk of people to let their strollers through, and with the possible near-term availability of stroller cattle-catchers to make their job easier, the balance of power has swung too far in their favor.

I think you should also look into selling defensive gear for the non-babied - perhaps nice hipster shin guards? You could start an arms war between the babied and the non-babied, stand back, and profit!

Carnivore wrote: How'd you like to be my CFO?

You're putting him in the wrong position! A person with that kind of strategic vision would be bored as CFO. His creative juices would be stifled.