I think companies will divide into two camps. Some, like BAE and HSBC, will take fright and create blanket rulings to avoid non-compliance in the short term. Banks in particular are terrified of non-compliance ever since the credit crunch, and their first reaction is to jump under a stone. The second set of businesses will pause, look more closely at the rules and build an effective IR35 assessment infrastructure, perhaps stealing a march their more timid competitors. Which camp will win? Not sure. Hopefully the second.
Another factor is increased working from home after the virus, which might provide yet more "unforeseen consequences". Not only can a client have you as a zero-rights "employee", but he can ask you to provide your own equipment and office too, something genuine contractors will be quite happy with.