Agreed. When its an abstract concept, most cops will say "Sure, I wouldn't turn on the people, I'll uphold the constitution!" but as soon as one of their "brothers" dies at the hands of an otherwise law abiding citizen that will change most of them.
I know we have several here that are police officers and I'm sure there will be some that will quit in disgust (and a few of those will join the resistance) or at least look the other way when it comes to newly illegal gun ownership, but I do not believe that the majority of police officers in this country will look at their kids college fund, their mortgage, the boat in their driveway and their dreams of a comfortable retirement and choose not to enforce these unconstitutional laws just to keep the checks flowing.