this is not entirely true!
you'd be better off doing your CCNA/CCDP for Security, wireless or Data Center.
It will increase your chances.
Security is BOOMING now, and Data Center will always be a need, keep in mind a lot of times when they say private cloud they mean on prem Data Center.
Wireless is getting bigger and bigger especially with the Internet of Everything and the Internet of Things.
Voice is whatever, these days companies are buying the Business Edition 6000, it comes with call manager for less than 1K endpoints and they are making it easier and easier to use, if you have problems you call TAC(tech assis center) if the company bought smartnet.
Voice is NOT where it's at!
I don't think Security field will really pick up unless the Feds start mandating a minimum level of security for companies. All you have right now is a bunch of companies that were recently breached panicking. Which means they'll go out and spend tons of money on overpriced IT Security consultants.