It doesn't make sense to concede that there is a high supply of lawyers and still argue that cost is driving up prices. The price of a service depends on the supply of the service and the demand curve. At a given level of supply, it is irrelevant what the cost of providing the service is, that will not change the cost.
It's valid to make the "guild" argument and say that the education requirement is driving up prices, but only if you argue that the education requirement is artificially restricting supply. When ABA-accredited schools are graduating about twice as many students as are getting hired, that's a difficult argument to make. Would salaries really go down if you added an entire category of potential hires below the current group that already isn't getting hired?
It's valid to make the "guild" argument and say that the education requirement is driving up prices, but only if you argue that the education requirement is artificially restricting supply. When ABA-accredited schools are graduating about twice as many students as are getting hired, that's a difficult argument to make. Would salaries really go down if you added an entire category of potential hires below the current group that already isn't getting hired?