Can you provide an overview of how wilson disease affects the liver?  

See below. Excessive deposition of copper in various tissue including liver, brain and eyes results in tissue damage. See this site for more info. http://www.mayoclinic.com/health/wilsons-disease/ds00411.
Could be bad. Wilson's disease leads to copper accumulation in the body - brain/liver/eyes and elsewhere - what it does to the liver? Well - imagine if you stuff your car engine with mud -things get, well, 'mucked up' - well that's the livers story - the liver does lots of stuff in the body - breaks down bad stuff, makes good stuff - and, is in the center of the circulation highway -so, muck up the liver and..