My client, a fairly large consultancy, is fairly ticked off right now. They have spent the last 6 months planning, assessing contractors, negotiating with clients, engaging lawyers etc. so they could keep as many of the outside IR35 contractors they currently engage. They've paid for insurance policies against the assessments, which were carried out by outside specialists. One pretty senior member of staff has been dedicated to preparing for this fuster cluck reform for that entire 6 months!
OK, some of this effort can be carried over to next year. However there are many parts which can't be.