By removing the Visa Waiver Scheme and making everyone from the UK have to apply/buy a Visa to enter the States it will mean th4e US can carry out greater security checks on each person.
Of course it will also mean having to que at the American Embassy to get a Visa, almost certianly have to pay money for a Visa and make travelling to America (be it on pleasure or business) a much harder and more annoying task.
The thing that makes this more irritating for me (if the NeoCons get their way and stop the Scheme) is that I once had a Lifelong Visa valid up to six months a time (and only having to be outside the US for one 24 hour period before the clock was reset for another six months) for the States which I got when I went to school over there. The thing was they removed that when I updated my passport in the early 90's as the Waiver Scheme had come into effect so they claimed I'd never need it again.
Looks like I might do now :(
(6m Brits in US visa curb; The Sun Online; Wednesday 30th August 2006)