>>5000550I've been a professional photographer for 10 years, and let me tell you, cut your GAS short right here.
You should not waste your time or money using FF for macro or wildlife. APS-C and micro four thirds are fine, and most animals are found in relatively evenly lit areas (ie: dappled light under trees) anyways so the 12-13 stop DR isn't an obstacle.
Definitely use full frame and medium format cameras for portraits, lifestyle editorial shooting, travel landscapes etc, if nothing else because those photos are normally more important than a bird or a bug even if you're just doing it for a hobby. I don't see a problem with wanting to save 100mp of paris, but even 50mp of sparrow is questionable. Taking high speed video of natural animal behavior would be more interesting.