There's a plenty reasons why you shouldn't put off the CCNA. For one, it's going to be years before IPv4 is completely a thing of the past. I would be willing to bet that if you pass the CCNA today, when you have to recertify in 3 years, IPv4 will still be around. For two, Cisco doesn't make drastic changes to their certs and start dropping topics haphazardly. For example, it's been some time since they stopped supporting SDM, but it hasn't been taken off of any exams. For three, there's always going to be something coming tomorrow that's going to supersede what you were tested on today. And four, there's a lot more to the CCNA than just IPv4.
The CCNA is a well recognized certification. Your resume won't get past a lot of HR checklists without it.