Download the latest version. Tuck it away somewhere on one of AC's famous thumb drives. Back up the databases, and you will be all good even if you have to disconnect from the Internet on those machines that run AC. There are other ways using configurable firewalls, but I won't get into that now.
Again, I doubt Jon will go so far as to make the program inoperable, because 1) it would be awful for business and 2) it would definitely leave a ton of patients out in the cold.
Having said all this, and also not liking the Wiki, I very much appreciate all of Roy's work on the Wiki, and ultimately, that may be the very EULA that Jon adopts.
This is such a great message board, and I am impressed that all of us contribute which very benign ideas and sometimes less than benign conversations, but compared with our friends over at EMRUpdate, we are a super mix of friends and colleagues.