If by "portable" you mean not portable because you'll need dongles to connect all of your older peripherals (unless you plan to buy all new versions), then sure! Lol.
Honestly, how much of a difference does it really make anymore? I've had both a 2009 13" MBP and a 2013 13' rMBP. Sure, I notice the difference between the two, but it's not as if I was breaking my back carrying the 09 around. But I only really use my Mac at home anymore. I have my iPhone for portability, and I have a work-issued MacBook Air at my job.