No, that's one reason I went with AirPlay for devices at home. My MBA can play to multiple speakers around the house and I can control it via the Apple Remote app on my phone or ipad. Alternately, Rogue Amoeba's Airfoil / Airfoil Speakers software allows me to play direct from my phone to multiple AirPlay speakers.
For your setup, consider keeping the SoundLink mini and using Airfoil on your MBP to make it AirPlay enabled. They get your second speaker either with AirPlay built in (I have a Bose SoundLink Air and it's great) or use an AirPort Express or AppleTV audio output to the AUX In of a speaker to enable it on AirPlay.
See
http://appadvice.com/appnn/2013/12/...-to-an-unsupported-bluetooth-wireless-speaker