You need to read the document carefully. There are some VERY positive points in there, such as the introduction of special visitor categories, and standard document lists for application, whcih would hopefully make the whole thing less arbitrary. And although I don't liek the bond idea, I have less of a problem with the idea that if the visitor absconds the sponsor can't sponsor again.
I doubt that any of this, either than the reduction to three months, will have much impact on those there though. I am sure the US will stay as non-visa nationals, although we might need clarification of this.
Vicky