Such things really does count against visiting the US compared to taking a week on a beach somewhere else.
It does, indeed. However, common sense would suggest that less intrusive measures would be applied than barcode tattoos if it ever got to this; in fact, common sense suggests that this sort of thing will never be more than the extreme views of a stupid poitician out to grab attention.
There are two things in what you say. One is the fact that many would be visitors stay away from America because of the news coming out. That is a real shame - America has a lot of interesting, impressive and beautiful things to see, and Americans are very nice people, in most cases. Unfortunately, there's also this massive, dark side that looms large in people's consciousness; I have, over the years, seem many, worrying stories in European news about people coming to the states as ordinary tourists and having extremely bad experiences. Things like one Danish young family, who did what all Danes do: go to a small restaurant, leaving the pram with their baby right outside the window where they could keep an eye. So, did criminals snatch it? Not at all, the police turned up, the couple ended up having to fight a long, hard battle in court against losing their child 'for neglect'. That is one couple, whose friends and family will never go to the States again. It is such a shame, because you guys could do a lot better.
The other thing is the question of making people identifiable - to be honest, I wouldn't mind being 'chip-marked' like many pets and horses are now. There are situations where you would definitely like to be identifiable, like if you're found unconscious without ID somewhere. Or perhaps more likely, as a simple convenience; it would be good if I never had to worry about remembering my passport or driving licence. I'm not worried about being monitored - anyone who carries a mobile around is being monitored, and probably hasn't a clue about what is being collected about them. I had a quick look at what is in my phone (Samsung) - something like tens of apps that I have not installed, and which have permission to snoop into everything including using GPS, microphone, camera and networking. If that doesn't worry me, why would I worry about being passively monitored by 'the government' in other ways, by a chip or similar means? At least they don't sell my data to scammers, the way private companies do. I think.