BoY! That sounds like a tough job. I'm still learning the ins and outs of Steem or Steem etiquette & don't really understand the witness system yet. My 1st thought is if a server's closed down the vote would or could be automatically rejected. Due to redundancy.
There are so many potential solutions that can be applied from those that are partial to those that actually take care of the issues.
I guess that it is easier to sweep things under the mat and enjoy the benefits that dead voters and dead witnesses bring to those who enjoy the extra votes and limited exposure of those who are not in the top 50.