I have considered this. Most things I do are in text editors and a command-line. I have iOS apps that I need to consider thinking about, but I also have a Mac Mini.
Let me ask, how is the hardware support on a MBP, say the latest Ubuntu? I like to be able to close my lid, toss my laptop in a bag and go. They open the lid and continue. Linux distros I tried to use as my main OS years ago never let this happen. Any other hardware support that is lacking? Touch pad, I have a Magic Trackpad 2 also, wireless, etc should be supported I would think.
Perhaps give Fedora or Ubuntu a try (just two off the top of my head, not looking for a distro fight).