You are dodging the point: since the PhD system was started under the academic guild system, when it started, you did not do a PhD to "make your own way". You did a PhD to become a scientist and enter the (metaphorical but real) Guild of Scientists spread throughout academia and industry, with steady, salaried employment as a Guild member reasonably assured.

People who were planning to make their own way got bachelors degrees, people who planned to teach got Masters degrees, and people who planned to research got PhDs.

Now, you can of course keep repeating "make your own way, you dumb ignoramus who doesn't understand market imperatives!" until the cows come home, but all that means is that you consider market imperatives to override guild structure.

Which they have! But a descriptive statement about how the system has come to work is not a normative statement about how it should be made to function. Certainly I would say the guild structure is malfunctioning when job qualifications have gone from "produce one masterpiece (a PhD) over a few years and you can get a job" to "produce two to three masterpieces (a PhD and one or two post-docs) over a dozen years, and then you're considered just about qualified to apply for a permanent job".

By the way, we're certainly not talking about my personal plans, since at this point I simply don't anticipate any currently-known career structure actually lasting. Even if nothing revolutionary actually happens on the political, economic, or environmental fronts, the continued subjugation of all institutions and enterprises to short-term market imperatives (the ones you support ;-)) means that job tenures longer than a few years probably just won't ever be available to me. I'm living in a world built by people who think Thomas Friedman has the right idea.

EDIT: It's important to note that if we really believed in fully and entirely replacing the Guild of Science with a scientific labor market subject only to market imperatives, it would mean taking a lot of funding from the university/lab administrators and tenured PI's, and using it to create a less-strictly-pyramidal career structure more like the tech sector has: bachelor's degree, junior-level researcher for a number of years at full pay and benefits, senior researcher at full pay and benefits with real job security, management and leadership.

In a real market system, you don't get to work people to the bone for years at a time for hourly wages less than those at Wal-Mart solely on the promise that they will someday have the opportunity to gain a 1/3 chance at a real job in their field. In a real market system, that is called an unpaid internship, it's illegal, and it ends in your workers unionizing and suing you.