Wanna Saw Off A Limb?

In the Star Trek episode Measure of a Man, Data raises an interesting point that I hadn't really considered about the Star Trek universe. When Captain Picard suggests that, as a Starfleet officer, he might have a duty to submit to the tests - potentially at his detriment - for the sake of the organization and the betterment of life, Data replies by asking why, if cybernetic eyes are far superior to organic eyes, it is not standard procedure for all officers to have theirs replaced. It's a  good way of pointing out the double standard being set for organic and synthetic life-forms, but to me it raises more interesting questions regarding the future of cyborgs.

Clearly, Star Trek takes place in an advanced society that would likely be capable of extreme and effective cybernetic enhancement, from Commander La Forge's eyes to prosthetic uses for Data's superior hands. And yet, apparently, it is the norm for people to go their whole lives in dangerous and high-risk jobs without subjecting themselves to modification. Given the show's general tone of the embracing of science and technology as a means of bettering life everywhere, it's peculiar to me that this is the case. At the same time, though, I have some supposition as to how a future like that could come about - and even why it's likely.

For my part, I think cyborgs, A.I.s, brain uploading, shared consciousness is all potentially fantastic. If the technology is successfully created, I think it'll drastically improve the quality of life for people everywhere, in the same way that antibiotics, the airplane, the wheel, and written language have. The ability to be unbounded from what genes evolutionary history and simple heredity have dealt to us is going to be great. At the same time however, I doubt that I'd be the first in line to have my brain pureed and my mind poured into an awesome robot body. Given my broad position on the subject, you - and even I - might think that strange and even hypocritical, but I suppose it comes down to visceral emotion in the end.

For all that I think it'll be a great thing to gain the ability to step beyond ourselves, I'm still attached to my body, for all it's flaws. I actively fear the idea of permanently marking myself, through tattoos or scars or loss of extremities, and I have a hard time imagining any point in time when I would be likely to throw any part of myself aside in favor of a replacement, however effective it might be. 

 And maybe that's the core problem with cyborgs as a supposed new normal. I'm already a minority in my opinions on the singularity, and if I can't really get into the idea of personally stepping beyond my body, how much can I really expect humankind as a whole to do that? Potentially, it would start slowly, and become geometrically more common among people, both as people get acclimated to the idea and as children grow up with cyborgs and cybernetic enhancement being at least acceptable. Maybe three or four generations after the first effective consumer grade augments become available, it'll become the new norm, and it'll be the shiny-awesome future I'm hoping for. 

I also have to wonder, though... how bad are the chances of that? Comparatively, what's the likelihood of cyborgs always being regarded as fringe, and people never getting over the squeamishness? 

And, I suppose if that future can still be Star Trek, is that so bad?