We have chips but magnetic strips are still on most credit cards and payments are still accepted that way in many older payments gateways. From what I read on the topic the cost of lost business if this was disabled is greater than eating the cost of skimmer attacks. There is a several year plan to phase it out entirely. It's mostly because initially when chips came out a lot of business owners were angry that they had to buy new payment machines and good luck explaining this to a none tech person.