Naked Viking has made valid points.
I hope the increase in security won't be used as an excuse by the more bolshy CC (the minority) to throw their weight around armed with the threat of offloading 'difficult' passengers. There is an attitude in some quarters that the passenger is always wrong. I worked as CC for a year before flying and saw then, and have seen since, situations getting completely out of hand because of bad handling by CC. Just like pilots, not all CC are perfect!
Years ago, I share a flat with a policeman at a time when London Transport introduced free bus travel for cops. He thought it was great at first, and then he and many colleagues started paying rather than let on they were cops because they found that bus staff were inclined to throw their weight and cause or aggravate situations because they knew there was a cop on board. I assume it settled down eventually.