Just to be clear... again... This is not actually scrapping IR35. The point at issue is who decides whether a contractor is really an employee or not. It used to be that the contractor decided for themselves, and since it was advantageous not to be considered an employee for tax reasons they would always commit tax evasion by falsely stating they weren't an employee even when they clearly were. This was then reversed where the employer had to decide whether someone was really an employee, since the employer didn't benefit by claiming the contractor was not an employee, and there was legal liability, they were much more likely to be honest about the contractor being an employee.
Frankly, this is all a bit silly, and the contractors should be bought into line with employees for tax purposes anyway. Just bring capital gains up to income tax rates for any business with less than 50 employees or something and stop theses stupid shenanigans.