Nobody with a solvent company will do it. It's like putting the tools to make money into the hands of privateers. What's to stop someone from creating something like Zaquencer for the BSP if the firmware was released as open source? People will buy firmware if it's good. That's money that Arturia won't see for their box and the coding that makes it work. Sure the coder did work hard to mod the firmware, but if it's open source, they paid jack shit to Arturia to create their sellable product. As my mate who makes music for money said, "I'm a musician, not a coder. I don't want to learn electronics/C++ to make a sequencer/effect/synth, that's why I pay for Synthrotek gadgets". His money should go to the people who conceived the product, developed the product, produced and marketed the product. Not someone who has taken the finished product and tweaked it.
Mutable Instruments release their firmware into the public realm, but only after the product has been discontinued. It's helped with keeping MIDIPal alive, with a few great mods of that product available, but Mutable Instruments gave up on making money from MIDIPal before they gave it to others to do so.