Without motion, interaction with the world around us is impossible.
Look at a limited list: Eye-motion, speech, battling gravity, self-defense against heat, animals and other threats, social interaction, including reproduction, developing tools.
None of these could have occurred without neuromuscular activity and proprioceptive feedback from that motion. Knowing what we now know about how movements and decisions to move involve a large number of brain areas, knowing that experiencing pain for instance involves many brain areas, is it safe to say that the whole brain and nervous system works as a very complex unit and mainly dedicated to motion? and therefore our brilliant thoughts are just along for the ride.
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Brain is for best guess strategy for survival up to at least reproduction, what it needs for that strategy will determine the cerebral complexity. It's an over simplification to say the brain is one thing; or even primarily if not totally just for locomotion to achieve said strategy. The brain, actually a collection of different things, house together environmentally coincidentally for humans and separate and separated for Octopi, so a leap of conclusion to state that if motor fixed, all the brain devolves if not used. Yes all motor cortex will atrophy or neuro-plastinated to another function but not all cerebral neurology will go, just the bit not needed anymore.
Things may be an ends to a means, the tail can wag the dog, clues it's not all about locomotion. Sometimes we do something for no better reason than, just because it's there. Just as time exists to stop everything happening all at once, perhaps the plastinated brain is there to stop us all being the same, irrespective of environment except filling that niche, the more complex the environment, the more complex the brain. If it was just about movement, the homunculus would look entirely different and i imagine it is for species where movement is critical (blue fin tuna?).
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