Good lord, the reason why the US is going to Chip and Sig isn't for security, it's for convenience. They know that the longer transactions take, the less happy the merchant and the customer will be. Add the fact that the most common PINs are 0000 and 1234, and the fact that people are dumb, and you'll have problems. Yes, the sig doesn't mean anything, but who cares. As a consumer, my credit card company takes care of all fraud, and all these cards are still vulnerable to CNP transactions.
Wat.
Chips take forever to authorize and work less reliably, from my experience. The fact that the industry is taking a step back in convenience and a step forward in security only helps NFC technology expand.