Also, in some counties (the UK is a prime example) the rules governing "impact" is largely dictated and/or influenced by central government. So not only do you

Also, in some counties (the UK is a prime example) the rules governing "impact" is largely dictated and/or influenced by central government. So not only do you need to change just your local institution but a whole country's institutions at a go; a multi-year political fiefdom protecting shambles at best.