The new rules probably won't change anything for the elite programs, but will slow down a bit for the mid, to lower D1s.
I think the rule proposed and accepted by the committee was to stop the early recruitment of freshman and sophmores, even younger. As Justbaseball mentioned, a lot of panic goes into the process, not all decisions are well thought as to the consequences of recruiting early.
Making September 1 the start date and not June 1, July 1 is because coaches are not in their offices at that time. Justbaseball is correct, coaches are on the road, come home and have meetings and work to do, don't always appreciate those drop ins, especially here in Florida where lots of summer tournaments take place.