Brain Capacity for Change

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On the one hand, this:

Although it took several decades, Merzenich and Bach-y-Rita were to help prove that Cajal and the scientific consensus were wrong. The adult brain was plastic. It could rewire itself, sometimes radically.

On the other hand, this, too:

It’s perhaps understandable why crazy levels of hope are raised when people read tales of apparently miraculous recovery from brain injury that feature people seeing again, hearing again, walking again and so on. These dramatic accounts can make it sound as ifanything is possible.

~Will Storr
The brain's miracle superpowers of improvement

So while our brain capacity for change or growth is far from zero, it is not infinite, either.